Circuit, terminal device, base station device, and method

ABSTRACT

[Object] To provide a structure of wireless communication for a device which can fly freely in 3-dimensional space.[Solution] A circuit includes: an acquisition unit configured to acquire information regarding a flight; and a measurement report control unit configured to control a measurement report process on a reference signal transmitted from a base station device, on a basis of the information regarding the flight acquired by the acquisition unit.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation Application of U.S. ApplicationSerial No. 16/083,817, filed Sep. 10, 2018, which is a National Stageapplication of PCT/JP2017/026198, filed Jul. 20, 2017, and claimspriority to Japanese Priority Application No. 2016-172196 filed Sep. 2,2016. The entire contents of the above-identified applications areincorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a circuit, a terminal device, a basestation device, and a method.

BACKGROUND ART

In recent years, research and development related to drones have beencarried out and are attracting interest. Drones are small unmannedaircraft also known as unmanned aerial vehicles (UAVs). According to theeconomic reports published by the US Association for Unmanned VehicleSystems International, the market size of drones was about 82 billiondollars in 2025 only in the US, and 1 hundred thousand new jobs areestimated to be created. Drones can provide products and informationusing air space which has not been used for any means on land, sea, orair. Therefore, drones are also called the industrial revolution of theair and are considered to be important business areas in the future.

In general, drones are assumed to fly while performing wirelesscommunication. Therefore, it is preferable to develop technologiesenabling drones to perform stable wireless communication. With regard towireless communication used by devices of which positions can bechanged, many technologies have been developed so far. For example,Patent Literature 1 below discloses a technology for reducing a load ofa communication network by collecting measurement results of speeds ofwireless communication in accordance with positions of terminal devices.Further, Patent Literature 2 below discloses a technology forconstructing a network in accordance with a disposition position of eachsensor included in a sensor network.

CITATION LIST Patent Literature

-   Patent Literature 1: JP 2016-92450A-   Patent Literature 2: JP 2006-74536A

DISCLOSURE OF INVENTION Technical Problem

However, wireless communication systems proposed in the foregoing patentliteratures or the like are not designed on the assumption of devicessuch as drones which can fly freely in 3-dimensional space.

Accordingly, the present disclosure provides a structure of wirelesscommunication for a device which can fly freely in 3-dimensional space.

Solution to Problem

According to the present disclosure, there is provided a circuitincluding: an acquisition unit configured to acquire informationregarding a flight; and a measurement report control unit configured tocontrol a measurement report process on a reference signal transmittedfrom a base station device, on a basis of the information regarding theflight acquired by the acquisition unit.

In addition, according to the present disclosure, there is provided aterminal device including: an acquisition unit configured to acquireinformation regarding a flight; and a measurement report control unitconfigured to control a measurement report process on a reference signaltransmitted from a base station device, on a basis of the informationregarding the flight acquired by the acquisition unit.

In addition, according to the present disclosure, there is provided abase station device including: a reference signal transmitting unitconfigured to transmit a reference signal; and a control unit configuredto acquire information regarding a flight and control a process based onmeasurement information reported from a terminal device that performs ameasurement report process on the reference signal on a basis of theacquired information regarding the flight.

In addition, according to the present disclosure, there is provided amethod including: acquiring information regarding a flight; andcontrolling, by a processor, a measurement report process on a referencesignal transmitted from a base station device, on a basis of theacquired information regarding the flight.

In addition, according to the present disclosure, there is provided amethod including: transmitting a reference signal; and acquiringinformation regarding a flight and controlling a process based onmeasurement information reported from a terminal device that performs ameasurement report process on the reference signal on a basis of theacquired information regarding the flight, by a processor.

Advantageous Effects of Invention

According to the present disclosure, as described above, it is possibleto provide a structure of wireless communication for a device which canfly freely in 3-dimensional space. Note that the effects described aboveare not necessarily limitative. With or in the place of the aboveeffects, there may be achieved any one of the effects described in thisspecification or other effects that may be grasped from thisspecification.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating an example of setting of a componentcarrier according to a present embodiment.

FIG. 2 is a diagram illustrating an example of setting of a componentcarrier according to a present embodiment.

FIG. 3 is a diagram illustrating an example of a downlink sub frame ofLTE according to the present embodiment.

FIG. 4 is a diagram illustrating an example of an uplink sub frame ofLTE according to the present embodiment.

FIG. 5 is a diagram illustrating examples of parameter sets related to atransmission signal in an NR cell.

FIG. 6 is a diagram illustrating an example of an NR downlink sub frameof the present embodiment.

FIG. 7 is a diagram illustrating an example of an NR uplink sub frame ofthe present embodiment.

FIG. 8 is a schematic block diagram illustrating a configuration of abase station device of the present embodiment.

FIG. 9 is a schematic block diagram illustrating a configuration of aterminal device of the present embodiment.

FIG. 10 is a diagram illustrating an example of downlink resourceelement mapping of NR according to the present embodiment.

FIG. 11 is a diagram illustrating an example of downlink resourceelement mapping of NR according to the present embodiment.

FIG. 12 is a diagram illustrating an example of downlink resourceelement mapping of NR according to the present embodiment.

FIG. 13 is a diagram illustrating an example of resource element mappingof NR according to the present embodiment.

FIG. 14 is a diagram illustrating an example of a resource elementmapping method of NR according to the present embodiment.

FIG. 15 is a diagram illustrating an example of a frame configuration ofself-contained transmission according to the present embodiment.

FIG. 16 is an explanatory diagram illustrating a technical problemaccording to the present embodiment.

FIG. 17 is an explanatory diagram illustrating an example of aconfiguration of a system according to the present embodiment.

FIG. 18 is a block diagram illustrating an example of a logicalconfiguration of a higher layer processing unit of a base station deviceaccording to the embodiment.

FIG. 19 is a block diagram illustrating an example of a logicalconfiguration of a drone according to the present embodiment.

FIG. 20 is an explanatory diagram illustrating an overview of technicalfeatures according to the present embodiment.

FIG. 21 is a diagram illustrating an example of wireless communicationwith high reliability for the drone according to the present embodiment.

FIG. 22 is a sequence diagram illustrating an example of a flow of afirst example of a measurement report process performed in a systemaccording to the present embodiment.

FIG. 23 is a sequence diagram illustrating an example of a flow of asecond example of a measurement report process performed in a systemaccording to the present embodiment.

FIG. 24 is a sequence diagram illustrating an example of a flow of athird example of a measurement report process performed in a systemaccording to the present embodiment.

FIG. 25 is a sequence diagram illustrating an example of a flow of ameasurement report process performed in the system according to thepresent embodiment.

FIG. 26 is a sequence diagram illustrating an example of a flow of ameasurement report process performed in the system according to thepresent embodiment.

FIG. 27 is a block diagram illustrating a first example of a schematicconfiguration of an eNB.

FIG. 28 is a block diagram illustrating a second example of theschematic configuration of the eNB.

DISCLOSURE OF INVENTION

Hereinafter, (a) preferred embodiment(s) of the present disclosure willbe described in detail with reference to the appended drawings. Notethat, in this specification and the appended drawings, structuralelements that have substantially the same function and structure aredenoted with the same reference numerals, and repeated explanation ofthese structural elements is omitted.

Further, in the present specification and the drawings, differentletters are suffixed to the same reference numerals to distinguishelements which have substantially the same functional configuration. Forexample, a plurality of elements which have substantially the samefunctional configuration are distinguished such as base station devices1A, 1B, and 1C, as necessary. Here, in a case in which it is notnecessary to particularly distinguish a plurality of elements which havesubstantially the same functional configuration, only the same referencenumeral is given. For example, in a case in which it is not necessary toparticularly distinguish base station devices 1A, 1B, and 1C, the basestation devices 1A, 1B, and 1C are simply referred to as the basestation devices 1.

Note that the description will be made in the following order.

-   1. Introduction-   2. Drone    -   2.1. Use cases    -   2.2. Wireless communication    -   2.3. Technical problem-   3. Configuration example    -   3.1. Configuration example of system    -   3.2. Detailed configuration example of each device-   4. Technical features    -   4.1. Overview    -   4.2. Flight-related information    -   4.3. First embodiment    -   4.4. Second embodiment    -   4.5. Supplement-   5. Application examples-   6. Conclusion

1. Introduction NR

Wireless access schemes and wireless networks of cellular mobilecommunication (hereinafter also referred to as Long Term Evolution(LTE),LTE-Advanced (LTE-A), LTE-Advanced Pro (LTE-A Pro), New Radio (NR), NewRadio Access Technology (NRAT), Evolved Universal Terrestrial RadioAccess (EUTRA), or Further EUTRA (FEUTRA)) are under review in 3rdGeneration Partnership Project (3GPP). Further, in the followingdescription, LTE includes LTE-A, LTE-A Pro, and EUTRA, and NR includesNRAT and FEUTRA. In LTE and NR, a base station device (base station) isalso referred to as an evolved Node B (eNodeB), and a terminal device (amobile station, a mobile station device, or a terminal) is also referredto as a user equipment (UE). Note that a different name from the eNodeBmay be used for the base station device in NR. For example, the basestation device can also be referred to as a gNodeB. LTE and NR arecellular communication systems in which a plurality of areas covered bya base station device are arranged in a cell form. A single base stationdevice may manage a plurality of cells.

NR is a different Radio Access Technology (RAT) from LTE as a wirelessaccess scheme of the next generation of LTE. NR is an access technologycapable of handling various use cases including Enhanced Mobilebroadband (eMBB), Massive Machine Type Communications (mMTC), and ultrareliable and Low Latency Communications (URLLC). NR is reviewed for thepurpose of a technology framework corresponding to use scenarios,request conditions, placement scenarios, and the like in such use cases.The details of the scenarios or request conditions of NR are disclosedin “3rd Generation Partnership Project; Technical Specification GroupRadio Access Network; Study on Scenarios and Requirements for NextGeneration Access Technologies; (Release 14), 3GPP TR 38.913 V0. 2.0(2016-02) http://www.3gpp.org/ftp//Specs/archive/38series/38.913/38913-020.zip”.

In LTE and NR, a predetermined time interval can be specified as a unitof a time at which data transmission is performed. The time interval isreferred to as a transmission time interval (TTI). A base station deviceand a terminal device transmit and receive a physical channel and/or aphysical signal on the basis of the TTI. For example, the details of theTTI in LTE is disclosed in “3rd Generation Partnership Project;Technical Specification Group Radio Access Network; Evolved UniversalTerrestrial Radio Access (E-UTRA) and Evolved Universal TerrestrialRadio Access Network (E-UTRAN); Overall description; Stage 2 (Release13), 3GPP TS 36.300 V13. 3.0.http://www.3gpp.org/ftp/Specs/archive/36_series/36. 300/36300-d30.zip.”

Further, the TTI is used as a unit in which an order of datatransmission is specified. For example, in the order of the datatransmission, a hybrid automatic repeat request-acknowledgement(HARQ-ACK) report indicating whether received data is correctly receivedis transmitted after data is received and a time specified as an integermultiple of the TTI elapses. In this case, a time taken to transmit data(delay or latency) is decided depending on the TTI. In particular, sincea request condition of the latency is different in accordance with a usecase, the TTI is preferably changed in accordance with the use case. Theorder of the data transmission is disclosed in “3rd GenerationPartnership Project; Technical Specification Group Radio Access Network;Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layerprocedures (Release 13), 3GPP TS 36.213 V13. 1.1. http://www.3gpp.org/ftp/Specs/archive/36_series/36. 213/36213-d11.zip.”

Technologies, functions, methods, configurations, and procedures to bedescribed below and all other descriptions can be applied to LTE and NRunless particularly stated otherwise.

<Wireless Communication System in the Present Embodiment>

In the present embodiment, a wireless communication system includes atleast a base station device 1 and a terminal device 2. The base stationdevice 1 can accommodate multiple terminal devices. The base stationdevice 1 can be connected with another base station device by means ofan X2 interface. Further, the base station device 1 can be connected toan evolved packet core (EPC) by means of an S1 interface. Further, thebase station device 1 can be connected to a mobility management entity(MME) by means of an S1-MME interface and can be connected to a servinggateway (S-GW) by means of an S1-U interface. The S1 interface supportsmany-to-many connection between the MME and/or the S-GW and the basestation device 1. Further, in the present embodiment, the base stationdevice 1 and the terminal device 2 each support LTE and/or NR.

<Wireless Access Technology According to Present Embodiment>

In the present embodiment, the base station device 1 and the terminaldevice 2 each support one or more wireless access technologies (RATs).For example, an RAT includes LTE and NR. A single RAT corresponds to asingle cell (component carrier). That is, in a case in which a pluralityof RATs are supported, the RATs each correspond to different cells. Inthe present embodiment, a cell is a combination of a downlink resource,an uplink resource, and/or a sidelink. Further, in the followingdescription, a cell corresponding to LTE is referred to as an LTE celland a cell corresponding to NR is referred to as an NR cell. Further,LTE is referred to as a first RAT and NR is referred to as a second RAT.

Downlink communication is communication from the base station device 1to the terminal device 2. Uplink communication is communication from theterminal device 2 to the base station device 1. Sidelink communicationis communication from the terminal device 2 to another terminal device2.

The sidelink communication is defined for contiguous direct detectionand contiguous direct communication between terminal devices. Thesidelink communication, a frame configuration similar to that of theuplink and downlink can be used. Further, the sidelink communication canbe restricted to some (sub sets) of uplink resources and/or downlinkresources.

The base station device 1 and the terminal device 2 can supportcommunication in which a set of one or more cells is used in a downlink,an uplink, and/or a sidelink. A set of a plurality of cells is alsoreferred to as carrier aggregation or dual connectivity. The details ofthe carrier aggregation and the dual connectivity will be describedbelow. Further, each cell uses a predetermined frequency bandwidth. Amaximum value, a minimum value, and a settable value in thepredetermined frequency bandwidth can be specified in advance.

FIG. 1 is a diagram illustrating an example of setting of a componentcarrier according to the present embodiment. In the example of FIG. 1 ,one LTE cell and two NR cells are set. One LTE cell is set as a primarycell. Two NR cells are set as a primary and secondary cell and asecondary cell. Two NR cells are integrated by the carrier aggregation.Further, the LTE cell and the NR cell are integrated by the dualconnectivity. Note that the LTE cell and the NR cell may be integratedby carrier aggregation. In the example of FIG. 1 , NR may not supportsome functions such as a function of performing standalone communicationsince connection can be assisted by an LTE cell which is a primary cell.The function of performing standalone communication includes a functionnecessary for initial connection.

FIG. 2 is a diagram illustrating an example of setting of a componentcarrier according to the present embodiment. In the example of FIG. 2 ,two NR cells are set. The two NR cells are set as a primary cell and asecondary cell, respectively, and are integrated by carrier aggregation.In this case, when the NR cell supports the function of performingstandalone communication, assist of the LTE cell is not necessary. Notethat the two NR cells may be integrated by dual connectivity.

<Radio Frame Configuration in Present Embodiment>

In the present embodiment, a radio frame configured with 10 ms(milliseconds) is specified. Each radio frame includes two half frames.A time interval of the half frame is 5 ms. Each half frame includes 5sub frames. The time interval of the sub frame is 1 ms and is defined bytwo successive slots. The time interval of the slot is 0.5 ms. An i-thsub frame in the radio frame includes a (2×i)-th slot and a (2×i+1)-thslot. In other words, 10 sub frames are specified in each of the radioframes.

Sub frames include a downlink sub frame, an uplink sub frame, a specialsub frame, a sidelink sub frame, and the like.

The downlink sub frame is a sub frame reserved for downlinktransmission. The uplink sub frame is a sub frame reserved for uplinktransmission. The special sub frame includes three fields. The threefields are a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), andan Uplink Pilot Time Slot (UpPTS). A total length of DwPTS, GP, andUpPTS is 1 ms. The DwPTS is a field reserved for downlink transmission.The UpPTS is a field reserved for uplink transmission. The GP is a fieldin which downlink transmission and uplink transmission are notperformed. Further, the special sub frame may include only the DwPTS andthe GP or may include only the GP and the UpPTS. The special sub frameis placed between the downlink sub frame and the uplink sub frame in TDDand used to perform switching from the downlink sub frame to the uplinksub frame. The sidelink sub frame is a sub frame reserved or set forsidelink communication. The sidelink is used for contiguous directcommunication and contiguous direct detection between terminal devices.

A single radio frame includes a downlink sub frame, an uplink sub frame,a special sub frame, and/or a sidelink sub frame. Further, a singleradio frame includes only a downlink sub frame, an uplink sub frame, aspecial sub frame, or a sidelink sub frame.

A plurality of radio frame configurations are supported. The radio frameconfiguration is specified by the frame configuration type. The frameconfiguration type 1 can be applied only to FDD. The frame configurationtype 2 can be applied only to TDD. The frame configuration type 3 can beapplied only to an operation of a licensed assisted access (LAA)secondary cell.

In the frame configuration type 2, a plurality of uplink-downlinkconfigurations are specified. In the uplink-downlink configuration, eachof 10 sub frames in one radio frame corresponds to one of the downlinksub frame, the uplink sub frame, and the special sub frame. The subframe 0, the sub frame 5 and the DwPTS are constantly reserved fordownlink transmission. The UpPTS and the sub frame just after thespecial sub frame are constantly reserved for uplink transmission.

In the frame configuration type 3, 10 sub frames in one radio frame arereserved for downlink transmission. The terminal device 2 treats eachsub frame as an empty sub frame. Unless a predetermined signal, channeland/or downlink transmission is detected in a certain sub frame, theterminal device 2 assumes that there is no signal and/or channel in thesub frame. The downlink transmission is exclusively occupied by one ormore consecutive sub frames. The first sub frame of the downlinktransmission may be started from any one in that sub frame. The last subframe of the downlink transmission may be either completely exclusivelyoccupied or exclusively occupied by a time interval specified in theDwPTS.

Further, in the frame configuration type 3, 10 sub frames in one radioframe may be reserved for uplink transmission. Further, each of 10 subframes in one radio frame may correspond to any one of the downlink subframe, the uplink sub frame, the special sub frame, and the sidelink subframe.

The base station device 1 may transmit a physical downlink channel and aphysical downlink signal in the DwPTS of the special sub frame. The basestation device 1 can restrict transmission of the PBCH in the DwPTS ofthe special sub frame. The terminal device 2 may transmit physicaluplink channels and physical uplink signals in the UpPTS of the specialsub frame. The terminal device 2 can restrict transmission of some ofthe physical uplink channels and the physical uplink signals in theUpPTS of the special sub frame.

<Frame Configuration of LTE in Present Embodiment>

FIG. 3 is a diagram illustrating an example of a downlink sub frame ofLTE according to the present embodiment. The diagram illustrated in FIG.3 is referred to as a downlink resource grid of LTE. The base stationdevice 1 can transmit a physical downlink channel of LTE and/or aphysical downlink signal of LTE in a downlink sub frame to the terminaldevice 2. The terminal device 2 can receive a physical downlink channelof LTE and/or a physical downlink signal of LTE in a downlink sub framefrom the base station device 1.

FIG. 4 is a diagram illustrating an example of an uplink sub frame ofLTE according to the present embodiment. The diagram illustrated in FIG.4 is referred to as an uplink resource grid of LTE. The terminal device2 can transmit a physical uplink channel of LTE and/or a physical uplinksignal of LTE in an uplink sub frame to the base station device 1. Thebase station device 1 can receive a physical uplink channel of LTEand/or a physical uplink signal of LTE in an uplink sub frame from theterminal device 2.

In the present embodiment, the LTE physical resources can be defined asfollows. One slot is defined by a plurality of symbols. The physicalsignal or the physical channel transmitted in each of the slots isrepresented by a resource grid. In the downlink, the resource grid isdefined by a plurality of sub carriers in a frequency direction and aplurality of OFDM symbols in a time direction. In the uplink, theresource grid is defined by a plurality of sub carriers in the frequencydirection and a plurality of SC-FDMA symbols in the time direction. Thenumber of sub carriers or the number of resource blocks may be decideddepending on a bandwidth of a cell. The number of symbols in one slot isdecided by a type of cyclic prefix (CP). The type of CP is a normal CPor an extended CP. In the normal CP, the number of OFDM symbols orSC-FDMA symbols constituting one slot is 7. In the extended CP, thenumber of OFDM symbols or SC-FDMA symbols constituting one slot is 6.Each element in the resource grid is referred to as a resource element.The resource element is identified using an index (number) of a subcarrier and an index (number) of a symbol. Further, in the descriptionof the present embodiment, the OFDM symbol or SC-FDMA symbol is alsoreferred to simply as a symbol.

The resource blocks are used for mapping a certain physical channel (thePDSCH, the PUSCH, or the like) to resource elements. The resource blocksinclude virtual resource blocks and physical resource blocks. A certainphysical channel is mapped to a virtual resource block. The virtualresource blocks are mapped to physical resource blocks. One physicalresource block is defined by a predetermined number of consecutivesymbols in the time domain. One physical resource block is defined froma predetermined number of consecutive sub carriers in the frequencydomain. The number of symbols and the number of sub carriers in onephysical resource block are decided on the basis of a parameter set inaccordance with a type of CP, a sub carrier interval, and/or a higherlayer in the cell. For example, in a case in which the type of CP is thenormal CP, and the sub carrier interval is 15 kHz, the number of symbolsin one physical resource block is 7, and the number of sub carriers is12. In this case, one physical resource block includes (7×12) resourceelements. The physical resource blocks are numbered from 0 in thefrequency domain. Further, two resource blocks in one sub framecorresponding to the same physical resource block number are defined asa physical resource block pair (a PRB pair or an RB pair).

In each LTE cell, one predetermined parameter is used in a certain subframe. For example, the predetermined parameter is a parameter relatedto a transmission signal. Parameters related to the transmission signalinclude a CP length, a sub carrier interval, the number of symbols inone sub frame (predetermined time length), the number of sub carriers inone resource block (predetermined frequency band), a multiple accessscheme, a signal waveform, and the like.

That is, In the LTE cell, a downlink signal and an uplink signal areeach generated using one predetermined parameter in a predetermined timelength (for example, a sub frame). In other words, in the terminaldevice 2, it is assumed that a downlink signal to be transmitted fromthe base station device 1 and an uplink signal to be transmitted to thebase station device 1 are each generated with a predetermined timelength with one predetermined parameter. Further, the base stationdevice 1 is set such that a downlink signal to be transmitted to theterminal device 2 and an uplink signal to be transmitted from theterminal device 2 are each generated with a predetermined time lengthwith one predetermined parameter.

<Frame Configuration of NR in Present Embodiment>

In each NR cell, one or more predetermined parameters are used in acertain predetermined time length (for example, a sub frame). That is,in the NR cell, a downlink signal and an uplink signal are eachgenerated using or more predetermined parameters in a predetermined timelength. In other words, in the terminal device 2, it is assumed that adownlink signal to be transmitted from the base station device 1 and anuplink signal to be transmitted to the base station device 1 are eachgenerated with one or more predetermined parameters in a predeterminedtime length. Further, the base station device 1 is set such that adownlink signal to be transmitted to the terminal device 2 and an uplinksignal to be transmitted from the terminal device 2 are each generatedwith a predetermined time length using one or more predeterminedparameters. In a case in which the plurality of predetermined parametersare used, a signal generated using the predetermined parameters ismultiplexed in accordance with a predetermined method. For example, thepredetermined method includes Frequency Division Multiplexing (FDM),Time Division Multiplexing (TDM), Code Division Multiplexing (CDM),and/or Spatial Division Multiplexing (SDM).

In a combination of the predetermined parameters set in the NR cell, aplurality of kinds of parameter sets can be specified in advance.

FIG. 5 is a diagram illustrating examples of the parameter sets relatedto a transmission signal in the NR cell. In the example of FIG. 5 ,parameters of the transmission signal included in the parameter setsinclude a sub carrier interval, the number of sub carriers per resourceblock in the NR cell, the number of symbols per sub frame, and a CPlength type. The CP length type is a type of CP length used in the NRcell. For example, CP length type 1 is equivalent to a normal CP in LTEand CP length type 2 is equivalent to an extended CP in LTE.

The parameter sets related to a transmission signal in the NR cell canbe specified individually with a downlink and an uplink. Further, theparameter sets related to a transmission signal in the NR cell can beset independently with a downlink and an uplink.

FIG. 6 is a diagram illustrating an example of an NR downlink sub frameof the present embodiment. In the example of FIG. 6 , signals generatedusing parameter set 1, parameter set 0, and parameter set 2 aresubjected to FDM in a cell (system bandwidth). The diagram illustratedin FIG. 6 is also referred to as a downlink resource grid of NR. Thebase station device 1 can transmit the physical downlink channel of NRand/or the physical downlink signal of NR in a downlink sub frame to theterminal device 2. The terminal device 2 can receive a physical downlinkchannel of NR and/or the physical downlink signal of NR in a downlinksub frame from the base station device 1.

FIG. 7 is a diagram illustrating an example of an NR uplink sub frame ofthe present embodiment. In the example of FIG. 7 , signals generatedusing parameter set 1, parameter set 0, and parameter set 2 aresubjected to FDM in a cell (system bandwidth). The diagram illustratedin FIG. 6 is also referred to as an uplink resource grid of NR. The basestation device 1 can transmit the physical uplink channel of NR and/orthe physical uplink signal of NR in an uplink sub frame to the terminaldevice 2. The terminal device 2 can receive a physical uplink channel ofNR and/or the physical uplink signal of NR in an uplink sub frame fromthe base station device 1.

<Antenna Port in Present Embodiment>

An antenna port is defined so that a propagation channel carrying acertain symbol can be inferred from a propagation channel carryinganother symbol in the same antenna port. For example, different physicalresources in the same antenna port can be assumed to be transmittedthrough the same propagation channel. In other words, for a symbol in acertain antenna port, it is possible to estimate and demodulate apropagation channel in accordance with the reference signal in theantenna port. Further, there is one resource grid for each antenna port.The antenna port is defined by the reference signal. Further, eachreference signal can define a plurality of antenna ports.

The antenna port is specified or identified with an antenna port number.For example, antenna ports 0 to 3 are antenna ports with which CRS istransmitted. That is, the PDSCH transmitted with antenna ports 0 to 3can be demodulated to CRS corresponding to antenna ports 0 to 3.

In a case in which two antenna ports satisfy a predetermined condition,the two antenna ports can be regarded as being a quasi co-location(QCL). The predetermined condition is that a wide area characteristic ofa propagation channel carrying a symbol in one antenna port can beinferred from a propagation channel carrying a symbol in another antennaport. The wide area characteristic includes a delay dispersion, aDoppler spread, a Doppler shift, an average gain, and/or an averagedelay.

In the present embodiment, the antenna port numbers may be defineddifferently for each RAT or may be defined commonly between RATs. Forexample, antenna ports 0 to 3 in LTE are antenna ports with which CRS istransmitted. In the NR, antenna ports 0 to 3 can be set as antenna portswith which CRS similar to that of LTE is transmitted. Further, in NR,the antenna ports with which CRS is transmitted like LTE can be set asdifferent antenna port numbers from antenna ports 0 to 3. In thedescription of the present embodiment, predetermined antenna portnumbers can be applied to LTE and/or NR.

<Physical Channel and Physical Signal in Present Embodiment>

In the present embodiment, physical channels and physical signals areused.

The physical channels include a physical downlink channel, a physicaluplink channel, and a physical sidelink channel. The physical signalsinclude a physical downlink signal, a physical uplink signal, and asidelink physical signal.

In LTE, a physical channel and a physical signal are referred to as anLTE physical channel and an LTE physical signal. In NR, a physicalchannel and a physical signal are referred to as an NR physical channeland an NR physical signal. The LTE physical channel and the NR physicalchannel can be defined as different physical channels, respectively. TheLTE physical signal and the NR physical signal can be defined asdifferent physical signals, respectively. In the description of thepresent embodiment, the LTE physical channel and the NR physical channelare also simply referred to as physical channels, and the LTE physicalsignal and the NR physical signal are also simply referred to asphysical signals. That is, the description of the physical channels canbe applied to any of the LTE physical channel and the NR physicalchannel. The description of the physical signals can be applied to anyof the LTE physical signal and the NR physical signal.

The physical downlink channel includes a Physical Broadcast Channel(PBCH), a Physical Control Format Indicator Channel (PCFICH), a PhysicalHybrid automatic repeat request Indicator Channel (PHICH), a PhysicalDownlink Control Channel (PDCCH), an Enhanced PDCCH (EPDCCH), a MachineType Communication (MTC) PDCCH (MTC MPDCCH), a Relay PDCCH (R-PDCCH), aPhysical Downlink Shared Channel (PDSCH), a Physical Multicast Channel(PMCH), and the like.

The physical downlink signal includes a Synchronization Signal (SS), aDownlink Reference Signal (DL-RS), a Discovery Signal (DS), and thelike.

The synchronization signal includes a primary synchronization signal(PSS), a secondary synchronization signal (SSS), and the like.

The reference signal in the downlink includes a cell-specific referencesignal (CRS), a UE-specific reference signal associated with the PDSCH(PDSCH-DMRS:), a demodulation reference signal associated with theEPDCCH (EPDCCH-DMRS), a positioning reference signal (PRS), a channelstate information (CSI) reference signal (CSI-RS), a tracking referencesignal (TRS), and the like. The PDSCH-DMRS is also referred to as a URSassociated with the PDSCH or referred to simply as a URS. TheEPDCCH-DMRS is also referred to as a DMRS associated with the EPDCCH orreferred to simply as DMRS. The PDSCH-DMRS and the EPDCCH-DMRS are alsoreferred to simply as a DL-DMRS or a downlink demodulation referencesignal. The CSI-RS includes a non-zero power CSI-RS (NZP CSI-RS).Further, the downlink resources include a zero power CSI-RS (ZP CSI-RS),a channel state information-interference measurement (CSI-IM), and thelike.

The physical uplink channel includes a physical uplink shared channel(PUSCH), a physical uplink control channel (PUCCH), a physical randomaccess channel (PRACH), and the like.

The physical uplink signal includes an uplink reference signal (UL-RS).

The uplink reference signal includes an uplink demodulation signal(LTL-DMRS), a sounding reference signal (SRS), and the like. The UL-DMRSis associated with transmission of the PUSCH or the PUCCH. The SRS isnot associated with transmission of the PUSCH or the PUCCH.

The physical sidelink channel includes a Physical Sidelink BroadcastChannel (PSBCH), a Physical Sidelink Control Channel (PSCCH), a PhysicalSidelink Discovery Channel (PSDCH), a Physical Sidelink Shared Channel(PSSCH), and the like.

The physical channel and the physical signal are also simply referred toa channel and a signal. That is, the physical downlink channel, thephysical uplink channel, and the physical sidelink channel are alsoreferred to as a downlink channel, an uplink channel, and a sidelinkchannel, respectively. The physical downlink signal, the physical uplinksignal, and the physical sidelink signal are also referred to as adownlink signal, an uplink signal, and a sidelink signal, respectively.

The BCH, the MCH, the UL-SCH, and the DL-SCH are transport channels. Thechannel used in the medium access control (MAC) layer is referred to asa transport channel. A unit of the transport channel used in the MAClayer is also referred to as a transport block (TB) or a MAC protocoldata unit (MAC PDU). In the MAC layer, control of a hybrid automaticrepeat request (HARQ) is performed for each transport block. Thetransport block is a unit of data that the MAC layer transfers(delivers) to the physical layer. In the physical layer, the transportblock is mapped to a codeword, and an encoding process is performed foreach codeword.

Note that the downlink reference signal and the uplink reference signalare also simply referred to as reference signals (RSs).

<LTE Physical Channel and LTE Physical Signal in Present Embodiment>

As described above, the description of the physical channel and thephysical signal can also be applied to the LTE physical channel and theLTE physical signal, respectively. The LTE physical channel and the LTEphysical signal are referred to as the following.

The LTE physical downlink channel includes an LTE-PBCH, an LTE-PCFICH,an LTE-PHICH, an LTE-PDCCH, an LTE-EPDCCH, an LTE-MPDCCH, anLTE-R-PDCCH, an LTE-PDSCH, an LTE-PMCH, and the like.

The LTE physical downlink signal an LTE-SS, an LTE-DL-RS, an LTE-DS, andthe like. The LTE-SS includes an LTE-PSS, an LTE-SSS, and the like. TheLTE-RS includes an LTE-CRS, an LTE-PDSCH-DMRS, an LTE-EPDCCH-DMRS, anLTE-RRS, an LTE-CSI-RS, an LTE-TRS, and the like.

The LTE physical uplink channel includes an LTE-PUSCH, an LTE-PUCCH, anLTE-PRACH, and the like.

The LTE physical uplink signal includes an LTE-UL-RS. The LTE-UL-RSincludes an LTE-UL-DMRS, an LTE-SRS, and the like.

The LTE physical sidelink channel includes an LTE-PSBCH, an LTE-PSCCH,an LTE-PSDCH, an LTE-PSSCH, and the like.

<NR Physical Channel and NR Physical Signal in Present Embodiment>

As described above, the description of the physical channel and thephysical signal can also be applied to the NR physical channel and theNR physical signal, respectively. The NR physical channel and the NRphysical signal are referred to as the following.

The NR physical downlink channel includes an NR-PBCH, an NR-PCFICH, anNR-PHICH, an NR-PDCCH, an NR-EPDCCH, an NR-MPDCCH, an NR-R-PDCCH, anNR-PDSCH, an NR-PMCH, and the like.

The NR physical downlink signal includes an NR-SS, an NR-DL-RS, anNR-DS, and the like. The NR-SS includes an NR-PSS, an NR-SSS, and thelike. The NR-RS includes an NR-CRS, an NR-PDSCH-DMRS, an NR-EPDCCH-DMRS,an NR-PRS, an NR-CSI-RS, an NR-TRS, and the like.

The NR physical uplink channel includes an NR-PUSCH, an NR-PUCCH, anNR-PRACH, and the like.

The NR physical uplink signal includes an NR-UL-RS. The NR-UL-RSincludesan NR-UL-DMRS, an NR-SRS, and the like.

The NR physical sidelink channel includes an NR-PSBCH, an NR-PSCCH, anNR-PSDCH, an NR-PSSCH, and the like.

<Physical Downlink Channel in Present Embodiment>

The PBCH is used to broadcast a master information block (MIB) which isbroadcast information specific to a serving cell of the base stationdevice 1. The PBCH is transmitted only through the sub frame 0 in theradio frame. The MIB can be updated at intervals of 40 ms. The PBCH isrepeatedly transmitted with a cycle of 10 ms. Specifically, initialtransmission of the MIB is performed in the sub frame 0 in the radioframe satisfying a condition that a remainder obtained by dividing asystem frame number (SFN) by 4 is 0, and retransmission (repetition) ofthe MIB is performed in the sub frame 0 in all the other radio frames.The SFN is a radio frame number (system frame number). The MIB is systeminformation. For example, the MIB includes information indicating theSFN.

The PCFICH is used to transmit information related to the number of OFDMsymbols used for transmission of the PDCCH. A region indicated by PCFICHis also referred to as a PDCCH region. The information transmittedthrough the PCFICH is also referred to as a control format indicator(CFI).

The PHICH is used to transmit an HARQ-ACK (an HARQ indicator, HARQfeedback, and response information) indicating ACKnowledgment (ACK) ornegative ACKnowledgment (NACK) of uplink data (an uplink shared channel(UL-SCH)) received by the base station device 1. For example, in a casein which the HARQ-ACK indicating ACK is received, corresponding uplinkdata is not retransmitted. For example, in a case in which the terminaldevice 2 receives the HARQ-ACK indicating NACK, the terminal device 2retransmits corresponding uplink data through a predetermined uplink subframe. A certain PHICH transmits the HARQ-ACK for certain uplink data.The base station device 1 transmits each HARQ-ACK to a plurality ofpieces of uplink data included in the same PUSCH using a plurality ofPHICHs.

The PDCCH and the EPDCCH are used to transmit downlink controlinformation (DCI). Mapping of an information bit of the downlink controlinformation is defined as a DCI format. The downlink control informationincludes a downlink grant and an uplink grant. The downlink grant isalso referred to as a downlink assignment or a downlink allocation.

The PDCCH is transmitted by a set of one or more consecutive controlchannel elements (CCEs). The CCE includes 9 resource element groups(REGs). An REG includes 4 resource elements. In a case in which thePDCCH is constituted by n consecutive CCEs, the PDCCH starts with a CCEsatisfying a condition that a remainder after dividing an index (number)i of the CCE by n is 0.

The EPDCCH is transmitted by a set of one or more consecutive enhancedcontrol channel elements (ECCEs). The ECCE is constituted by a pluralityof enhanced resource element groups (EREGs).

The downlink grant is used for scheduling of the PDSCH in a certaincell. The downlink grant is used for scheduling of the PDSCH in the samesub frame as a sub frame in which the downlink grant is transmitted. Theuplink grant is used for scheduling of the PUSCH in a certain cell. Theuplink grant is used for scheduling of a single PUSCH in a fourth subframe from a sub frame in which the uplink grant is transmitted orlater.

A cyclic redundancy check (CRC) parity bit is added to the DCI. The CRCparity bit is scrambled using a radio network temporary identifier(RNTI). The RNTI is an identifier that can be specified or set inaccordance with a purpose of the DCI or the like. The RNTI is anidentifier specified in a specification in advance, an identifier set asinformation specific to a cell, an identifier set as informationspecific to the terminal device 2, or an identifier set as informationspecific to a group to which the terminal device 2 belongs. For example,in monitoring of the PDCCH or the EPDCCH, the terminal device 2descrambles the CRC parity bit added to the DCI with a predeterminedRNTI and identifies whether or not the CRC is correct. In a case inwhich the CRC is correct, the DCI is understood to be a DCI for theterminal device 2.

The PDSCH is used to transmit downlink data (a downlink shared channel(DL-SCH)). Further, the PDSCH is also used to transmit controlinformation of a higher layer.

The PMCH is used to transmit multicast data (a multicast channel (MCH)).

In the PDCCH region, a plurality of PDCCHs may be multiplexed accordingto frequency, time, and/or space. In the EPDCCH region, a plurality ofEPDCCHs may be multiplexed according to frequency, time, and/or space.In the PDSCH region, a plurality of PDSCHs may be multiplexed accordingto frequency, time, and/or space. The PDCCH, the PDSCH, and/or theEPDCCH may be multiplexed according to frequency, time, and/or space.

< Physical Downlink Signal in Present Embodiment>

A synchronization signal is used for the terminal device 2 to obtaindownlink synchronization in the frequency domain and/or the time domain.The synchronization signal includes a primary synchronization signal(PSS) and a secondary synchronization signal (SSS). The synchronizationsignal is placed in a predetermined sub frame in the radio frame. Forexample, in the TDD scheme, the synchronization signal is placed in thesub frames 0, 1, 5, and 6 in the radio frame. In the FDD scheme, thesynchronization signal is placed in the sub frames 0 and 5 in the radioframe.

The PSS may be used for coarse frame/timing synchronization(synchronization in the time domain) or cell group identification. TheSSS may be used for more accurate frame timing synchronization or cellidentification. In other words, frame timing synchronization and cellidentification can be performed using the PSS and the SSS.

The downlink reference signal is used for the terminal device 2 toperform propagation path estimation of the physical downlink channel,propagation path correction, calculation of downlink channel stateinformation (CSI), and/or measurement of positioning of the terminaldevice 2.

The CRS is transmitted in the entire band of the sub frame. The CRS isused for receiving (demodulating) the PBCH, the PDCCH, the PHICH, thePCFICH, and the PDSCH. The CRS may be used for the terminal device 2 tocalculate the downlink channel state information. The PBCH, the PDCCH,the PHICH, and the PCFICH are transmitted through the antenna port usedfor transmission of the CRS. The CRS supports the antenna portconfigurations of 1, 2, or 4. The CRS is transmitted through one or moreof the antenna ports 0 to 3.

The URS associated with the PDSCH is transmitted through a sub frame anda band used for transmission of the PDSCH with which the URS isassociated. The URS is used for demodulation of the PDSCH to which theURS is associated. The URS associated with the PDSCH is transmittedthrough one or more of the antenna ports 5 and 7 to 14.

The PDSCH is transmitted through an antenna port used for transmissionof the CRS or the URS on the basis of the transmission mode and the DCIformat. A DCI format 1A is used for scheduling of the PDSCH transmittedthrough an antenna port used for transmission of the CRS. A DCI format2D is used for scheduling of the PDSCH transmitted through an antennaport used for transmission of the URS.

The DMRS associated with the EPDCCH is transmitted through a sub frameand a band used for transmission of the EPDCCH to which the DMRS isassociated. The DMRS is used for demodulation of the EPDCCH with whichthe DMRS is associated. The EPDCCH is transmitted through an antennaport used for transmission of the DMRS. The DMRS associated with theEPDCCH is transmitted through one or more of the antenna ports 107 to114.

The CSI-RS is transmitted through a set sub frame.

The resources in which the CSI-RS is transmitted are set by the basestation device 1. The CSI-RS is used for the terminal device 2 tocalculate the downlink channel state information. The terminal device 2performs signal measurement (channel measurement) using the CSI-RS. TheCSI-RS supports setting of some or all of the antenna ports 1, 2, 4, 8,12, 16, 24, and 32. The CSI-RS is transmitted through one or more of theantenna ports 15 to 46. Further, an antenna port to be supported may bedecided on the basis of a terminal device capability of the terminaldevice 2, setting of an RRC parameter, and/or a transmission mode to beset.

Resources of the ZP CSI-RS are set by a higher layer. Resources of theZP CSI-RS are transmitted with zero output power. In other words, theresources of the ZP CSI-RS are not transmitted. The ZP PDSCH and theEPDCCH are not transmitted in the resources in which the ZP CSI-RS isset. For example, the resources of the ZP CSI-RS are used for a neighborcell to transmit the NZP CSI-RS. Further, for example, the resources ofthe ZP CSI-RS are used to measure the CSI-IM. Further, for example, theresources of the ZP CSI-RS are resources with which a predeterminedchannel such as the PDSCH is not transmitted. In other words, thepredetermined channel is mapped (to be rate-matched or punctured) exceptfor the resources of the ZP CSI-RS.

Resources of the CSI-IM are set by the base station device 1. Theresources of the CSI-IM are resources used for measuring interference inCSI measurement. The resources of the CSI-IM can be set to overlap someof the resources of the ZP CSI-RS. For example, in a case in which theresources of the CSI-IM are set to overlap some of the resources of theZP CSI-RS, a signal from a cell performing the CSI measurement is nottransmitted in the resources. In other words, the base station device 1does not transmit the PDSCH, the EPDCCH, or the like in the resourcesset by the CSI-IM. Therefore, the terminal device 2 can perform the CSImeasurement efficiently.

The MBSFN RS is transmitted in the entire band of the sub frame used fortransmission of the PMCH. The MBSFN RS is used for demodulation of thePMCH. The PMCH is transmitted through an antenna port used fortransmission of the MBSFN RS. The MBSFN RS is transmitted through theantenna port 4.

The PRS is used for the terminal device 2 to measure positioning of theterminal device 2. The PRS is transmitted through the antenna port 6.

The TRS can be mapped only to predetermined sub frames. For example, theTRS is mapped to the sub frames 0 and 5. Further, the TRS can use aconfiguration similar to a part or all of the CRS. For example, in eachresource block, a position of a resource element to which the TRS ismapped can be caused to coincide with a position of a resource elementto which the CRS of the antenna port 0 is mapped. Further, a sequence(value) used for the TRS can be decided on the basis of information setthrough the PBCH, the PDCCH, the EPDCCH, or the PDSCH (RRC signaling). Asequence (value) used for the TRS can be decided on the basis of aparameter such as a cell ID (for example, a physical layer cellidentifier), a slot number, or the like. A sequence (value) used for theTRS can be decided by a method (formula) different from that of asequence (value) used for the CRS of the antenna port 0.

< Physical Uplink Signal in Present Embodiment>

The PUCCH is a physical channel used for transmitting uplink controlinformation (UCI). The uplink control information includes downlinkchannel state information (CSI), a scheduling request (SR) indicating arequest for PUSCH resources, and a HARQ-ACK to downlink data (atransport block (TB) or a downlink-shared channel (DL-SCH)). TheHARQ-ACK is also referred to as ACK/NACK, HARQ feedback, or responseinformation. Further, the HARQ-ACK to downlink data indicates ACK, NACK,or DTX.

The PUSCH is a physical channel used for transmitting uplink data(uplink-shared channel (UL-SCH)). Further, the PUSCH may be used totransmit the HARQ-ACK and/or the channel state information together withuplink data. Further, the PUSCH may be used to transmit only the channelstate information or only the HARQ-ACK and the channel stateinformation.

The PRACH is a physical channel used for transmitting a random accesspreamble. The PRACH can be used for the terminal device 2 to obtainsynchronization in the time domain with the base station device 1.Further, the PRACH is also used to indicate an initial connectionestablishment procedure (process), a handover procedure, a connectionre-establishment procedure, synchronization (timing adjustment) foruplink transmission, and/or a request for PUSCH resources.

In the PUCCH region, a plurality of PUCCHs are frequency, time, space,and/or code multiplexed. In the PUSCH region, a plurality of PUSCHs maybe frequency, time, space, and/or code multiplexed. The PUCCH and thePUSCH may be frequency, time, space, and/or code multiplexed. The PRACHmay be placed over a single sub frame or two sub frames. A plurality ofPRACHs may be code-multiplexed.

< Physical Uplink Signal in Present Embodiment>

The uplink DMRS is associated with transmission of the PUSCH or thePUCCH. The DMRS is time-multiplexed with the PUSCH or the PUCCH. Thebase station device 1 may use the DMRS to perform the propagation pathcorrection of the PUSCH or the PUCCH. In the description of the presentembodiment, the transmission of the PUSCH also includes multiplexing andtransmitting the PUSCH and DMRS. In the description of the presentembodiment, the transmission of the PUCCH also includes multiplexing andtransmitting the PUCCH and the DMRS. Further, the uplink DMRS is alsoreferred to as an UL-DMRS. The SRS is not associated with thetransmission of the PUSCH or the PUCCH. The base station device 1 mayuse the SRS to measure the uplink channel state.

The SRS is transmitted using the last SC-FDMA symbol in the uplink subframe. In other words, the SRS is placed in the last SC-FDMA symbol inthe uplink sub frame. The terminal device 2 can restrict simultaneoustransmission of the SRS, the PUCCH, the PUSCH, and/or the PRACH in acertain SC-FDMA symbol of a certain cell. The terminal device 2 cantransmit the PUSCH and/or the PUCCH using the SC-FDMA symbol excludingthe last SC-FDMA symbol in a certain uplink sub frame of a certain cellin the uplink sub frame and transmit the SRS using the last SC-FDMAsymbol in the uplink sub frame. In other words, the terminal device 2can transmit the SRS, the PUSCH, and the PUCCH in a certain uplink subframe of a certain cell.

In the SRS, a trigger type 0 SRS and a trigger type 1 SRS are defined asSRSs having different trigger types. The trigger type 0 SRS istransmitted in a case in which a parameter related to the trigger type 0SRS is set by signaling of a higher layer. The trigger type 1 SRS istransmitted in a case in which a parameter related to the trigger type 1SRS is set by signaling of the higher layer, and transmission isrequested by an SRS request included in the DCI format 0, 1A, 2B, 2C,2D, or 4. Further, the SRS request is included in both FDD and TDD forthe DCI format 0, 1A, or 4 and included only in TDD for the DCI format2B, 2C, or 2D. In a case in which the transmission of the trigger type 0SRS and the transmission of the trigger type 1 SRS occur in the same subframe of the same serving cell, a priority is given to the transmissionof the trigger type 1 SRS.

<Configuration Example of Base Station Device 1 in Present Embodiment>

FIG. 8 is a schematic block diagram illustrating a configuration of thebase station device 1 of the present embodiment. As illustrated in FIG.3 , the base station device 1 includes a higher layer processing unit101, a control unit 103, a receiving unit 105, a transmitting unit 107,and a transceiving antenna 109. Further, the receiving unit 105 includesa decoding unit 1051, a demodulating unit 1053, a demultiplexing unit1055, a wireless receiving unit 1057, and a channel measuring unit 1059.Further, the transmitting unit 107 includes an encoding unit 1071, amodulating unit 1073, a multiplexing unit 1075, a wireless transmittingunit 1077, and a downlink reference signal generating unit 1079.

As described above, the base station device 1 can support one or moreRATs. Some or all of the units included in the base station device 1illustrated in FIG. 8 can be configured individually in accordance withthe RAT. For example, the receiving unit 105 and the transmitting unit107 are configured individually in LTE and NR. Further, in the NR cell,some or all of the units included in the base station device 1illustrated in FIG. 8 can be configured individually in accordance witha parameter set related to the transmission signal. For example, in acertain NR cell, the wireless receiving unit 1057 and the wirelesstransmitting unit 1077 can be configured individually in accordance witha parameter set related to the transmission signal.

The higher layer processing unit 101 performs processes of a mediumaccess control (MAC) layer, a packet data convergence protocol (PDCP)layer, a radio link control (RLC) layer, and a radio resource control(RRC) layer. Further, the higher layer processing unit 101 generatescontrol information to control the receiving unit 105 and thetransmitting unit 107 and outputs the control information to the controlunit 103.

The control unit 103 controls the receiving unit 105 and thetransmitting unit 107 on the basis of the control information from thehigher layer processing unit 101. The control unit 103 generates controlinformation to be transmitted to the higher layer processing unit 101and outputs the control information to the higher layer processing unit101. The control unit 103 receives a decoded signal from the decodingunit 1051 and a channel estimation result from the channel measuringunit 1059. The control unit 103 outputs a signal to be encoded to theencoding unit 1071. Further, the control unit 103 is used to control thewhole or a part of the base station device 1.

The higher layer processing unit 101 performs a process and managementrelated to RAT control, radio resource control, sub frame setting,scheduling control, and/or CSI report control.

The process and the management in the higher layer processing unit 101are performed for each terminal device or in common to terminal devicesconnected to the base station device. The process and the management inthe higher layer processing unit 101 may be performed only by the higherlayer processing unit 101 or may be acquired from a higher node oranother base station device. Further, the process and the management inthe higher layer processing unit 101 may be individually performed inaccordance with the RAT. For example, the higher layer processing unit101 individually performs the process and the management in LTE and theprocess and the management in NR.

Under the RAT control of the higher layer processing unit 101,management related to the RAT is performed. For example, under the RATcontrol, the management related to LTE and/or the management related toNR is performed. The management related to NR includes setting and aprocess of a parameter set related to the transmission signal in the NRcell.

In the radio resource control in the higher layer processing unit 101,generation and/or management of downlink data (transport block), systeminformation, an RRC message (RRC parameter), and/or a MAC controlelement (CE) are performed.

In a sub frame setting in the higher layer processing unit 101,management of a sub frame setting, a sub frame pattern setting, anuplink-downlink setting, an uplink reference UL-DL setting, and/or adownlink reference UL-DL setting is performed. Further, the sub framesetting in the higher layer processing unit 101 is also referred to as abase station sub frame setting. Further, the sub frame setting in thehigher layer processing unit 101 can be decided on the basis of anuplink traffic volume and a downlink traffic volume. Further, the subframe setting in the higher layer processing unit 101 can be decided onthe basis of a scheduling result of scheduling control in the higherlayer processing unit 101.

In the scheduling control in the higher layer processing unit 101, afrequency and a sub frame to which the physical channel is allocated, acoding rate, a modulation scheme, and transmission power of the physicalchannels, and the like are decided on the basis of the received channelstate information, an estimation value, a channel quality, or the likeof a propagation path input from the channel measuring unit 1059, andthe like. For example, the control unit 103 generates the controlinformation (DCI format) on the basis of the scheduling result of thescheduling control in the higher layer processing unit 101.

In the CSI report control in the higher layer processing unit 101, theCSI report of the terminal device 2 is controlled. For example, asettings related to the CSI reference resources assumed to calculate theCSI in the terminal device 2 is controlled.

Under the control from the control unit 103, the receiving unit 105receives a signal transmitted from the terminal device 2 via thetransceiving antenna 109, performs a reception process such asdemultiplexing, demodulation, and decoding, and outputs informationwhich has undergone the reception process to the control unit 103.Further, the reception process in the receiving unit 105 is performed onthe basis of a setting which is specified in advance or a settingnotified from the base station device 1 to the terminal device 2.

The wireless receiving unit 1057 performs conversion into anintermediate frequency (down conversion), removal of an unnecessaryfrequency component, control of an amplification level such that asignal level is appropriately maintained, quadrature demodulation basedon an in-phase component and a quadrature component of a receivedsignal, conversion from an analog signal into a digital signal, removalof a guard interval (GI), and/or extraction of a signal in the frequencydomain by fast Fourier transform (FFT) on the uplink signal received viathe transceiving antenna 109.

The demultiplexing unit 1055 separates the uplink channel such as thePUCCH or the PUSCH and/or uplink reference signal from the signal inputfrom the wireless receiving unit 1057. The demultiplexing unit 1055outputs the uplink reference signal to the channel measuring unit 1059.The demultiplexing unit 1055 compensates the propagation path for theuplink channel from the estimation value of the propagation path inputfrom the channel measuring unit 1059.

The demodulating unit 1053 demodulates the reception signal for themodulation symbol of the uplink channel using a modulation scheme suchas binary phase shift keying (BPSK), quadrature phase shift keying(QPSK), 16 quadrature amplitude modulation (QAM), 64 QAM, or 256 QAM.The demodulating unit 1053 performs separation and demodulation of aMIMO multiplexed uplink channel.

The decoding unit 1051 performs a decoding process on encoded bits ofthe demodulated uplink channel. The decoded uplink data and/or uplinkcontrol information are output to the control unit 103. The decodingunit 1051 performs a decoding process on the PUSCH for each transportblock.

The channel measuring unit 1059 measures the estimation value, a channelquality, and/or the like of the propagation path from the uplinkreference signal input from the demultiplexing unit 1055, and outputsthe estimation value, a channel quality, and/or the like of thepropagation path to the demultiplexing unit 1055 and/or the control unit103. For example, the estimation value of the propagation path forpropagation path compensation for the PUCCH or the PUSCH is measuredthrough the UL-DMRS, and an uplink channel quality is measured throughthe SRS.

The transmitting unit 107 carries out a transmission process such asencoding, modulation, and multiplexing on downlink control informationand downlink data input from the higher layer processing unit 101 underthe control of the control unit 103. For example, the transmitting unit107 generates and multiplexes the PHICH, the PDCCH, the EPDCCH, thePDSCH, and the downlink reference signal and generates a transmissionsignal. Further, the transmission process in the transmitting unit 107is performed on the basis of a setting which is specified in advance, asetting notified from the base station device 1 to the terminal device2, or a setting notified through the PDCCH or the EPDCCH transmittedthrough the same sub frame.

The encoding unit 1071 encodes the HARQ indicator (HARQ-ACK), thedownlink control information, and the downlink data input from thecontrol unit 103 using a predetermined coding scheme such as blockcoding, convolutional coding, turbo coding, or the like. The modulatingunit 1073 modulates the encoded bits input from the encoding unit 1071using a predetermined modulation scheme such as BPSK, QPSK, 16 QAM, 64QAM, or 256 QAM. The downlink reference signal generating unit 1079generates the downlink reference signal on the basis of a physical cellidentification (PCI), an RRC parameter set in the terminal device 2, andthe like. The multiplexing unit 1075 multiplexes a modulated symbol andthe downlink reference signal of each channel and arranges resultingdata in a predetermined resource element.

The wireless transmitting unit 1077 performs processes such asconversion into a signal in the time domain by inverse fast Fouriertransform (IFFT), addition of the guard interval, generation of abaseband digital signal, conversion in an analog signal, quadraturemodulation, conversion from a signal of an intermediate frequency into asignal of a high frequency (up conversion), removal of an extrafrequency component, and amplification of power on the signal from themultiplexing unit 1075, and generates a transmission signal. Thetransmission signal output from the wireless transmitting unit 1077 istransmitted through the transceiving antenna 109.

<Configuration Example of Base Station Device 1 in Present Embodiment>

FIG. 9 is a schematic block diagram illustrating a configuration of theterminal device 2 of the present embodiment. As illustrated in FIG. 4 ,the terminal device 2 includes a higher layer processing unit 201, acontrol unit 203, a receiving unit 205, a transmitting unit 207, and atransceiving antenna 209. Further, the receiving unit 205 includes adecoding unit 2051, a demodulating unit 2053, a demultiplexing unit2055, a wireless receiving unit 2057, and a channel measuring unit 2059.Further, the transmitting unit 207 includes an encoding unit 2071, amodulating unit 2073, a multiplexing unit 2075, a wireless transmittingunit 2077, and an uplink reference signal generating unit 2079.

As described above, the terminal device 2 can support one or more RATs.Some or all of the units included in the terminal device 2 illustratedin FIG. 9 can be configured individually in accordance with the RAT. Forexample, the receiving unit 205 and the transmitting unit 207 areconfigured individually in LTE and NR. Further, in the NR cell, some orall of the units included in the terminal device 2 illustrated in FIG. 9can be configured individually in accordance with a parameter setrelated to the transmission signal. For example, in a certain NR cell,the wireless receiving unit 2057 and the wireless transmitting unit 2077can be configured individually in accordance with a parameter setrelated to the transmission signal.

The higher layer processing unit 201 outputs uplink data (transportblock) to the control unit 203. The higher layer processing unit 201performs processes of a medium access control (MAC) layer, a packet dataconvergence protocol (PDCP) layer, a radio link control (RLC) layer, anda radio resource control (RRC) layer. Further, the higher layerprocessing unit 201 generates control information to control thereceiving unit 205 and the transmitting unit 207 and outputs the controlinformation to the control unit 203.

The control unit 203 controls the receiving unit 205 and thetransmitting unit 207 on the basis of the control information from thehigher layer processing unit 201. The control unit 203 generates controlinformation to be transmitted to the higher layer processing unit 201and outputs the control information to the higher layer processing unit201. The control unit 203 receives a decoded signal from the decodingunit 2051 and a channel estimation result from the channel measuringunit 2059. The control unit 203 outputs a signal to be encoded to theencoding unit 2071. Further, the control unit 203 may be used to controlthe whole or a part of the terminal device 2.

The higher layer processing unit 201 performs a process and managementrelated to RAT control, radio resource control, sub frame setting,scheduling control, and/or CSI report control. The process and themanagement in the higher layer processing unit 201 are performed on thebasis of a setting which is specified in advance and/or a setting basedon control information set or notified from the base station device 1.For example, the control information from the base station device 1includes the RRC parameter, the MAC control element, or the DCI.Further, the process and the management in the higher layer processingunit 201 may be individually performed in accordance with the RAT. Forexample, the higher layer processing unit 201 individually performs theprocess and the management in LTE and the process and the management inNR.

Under the RAT control of the higher layer processing unit 201,management related to the RAT is performed. For example, under the RATcontrol, the management related to LTE and/or the management related toNR is performed. The management related to NR includes setting and aprocess of a parameter set related to the transmission signal in the NRcell.

In the radio resource control in the higher layer processing unit 201,the setting information in the terminal device 2 is managed. In theradio resource control in the higher layer processing unit 201,generation and/or management of uplink data (transport block), systeminformation, an RRC message (RRC parameter), and/or a MAC controlelement (CE) are performed.

In the sub frame setting in the higher layer processing unit 201, thesub frame setting in the base station device 1 and/or a base stationdevice different from the base station device 1 is managed. The subframe setting includes an uplink or downlink setting for the sub frame,a sub frame pattern setting, an uplink-downlink setting, an uplinkreference UL-DL setting, and/or a downlink reference UL-DL setting.Further, the sub frame setting in the higher layer processing unit 201is also referred to as a terminal sub frame setting.

In the scheduling control in the higher layer processing unit 201,control information for controlling scheduling on the receiving unit 205and the transmitting unit 207 is generated on the basis of the DCI(scheduling information) from the base station device 1.

In the CSI report control in the higher layer processing unit 201,control related to the report of the CSI to the base station device 1 isperformed. For example, in the CSI report control, a setting related tothe CSI reference resources assumed for calculating the CSI by thechannel measuring unit 2059 is controlled. In the CSI report control,resource (timing) used for reporting the CSI is controlled on the basisof the DCI and/or the RRC parameter.

Under the control from the control unit 203, the receiving unit 205receives a signal transmitted from the base station device 1 via thetransceiving antenna 209, performs a reception process such asdemultiplexing, demodulation, and decoding, and outputs informationwhich has undergone the reception process to the control unit 203.Further, the reception process in the receiving unit 205 is performed onthe basis of a setting which is specified in advance or a notificationfrom the base station device 1 or a setting.

The wireless receiving unit 2057 performs conversion into anintermediate frequency (down conversion), removal of an unnecessaryfrequency component, control of an amplification level such that asignal level is appropriately maintained, quadrature demodulation basedon an in-phase component and a quadrature component of a receivedsignal, conversion from an analog signal into a digital signal, removalof a guard interval (GI), and/or extraction of a signal in the frequencydomain by fast Fourier transform (FFT) on the uplink signal received viathe transceiving antenna 209.

The demultiplexing unit 2055 separates the downlink channel such as thePHICH, PDCCH, EPDCCH, or PDSCH, downlink synchronization signal and/ordownlink reference signal from the signal input from the wirelessreceiving unit 2057. The demultiplexing unit 2055 outputs the uplinkreference signal to the channel measuring unit 2059. The demultiplexingunit 2055 compensates the propagation path for the uplink channel fromthe estimation value of the propagation path input from the channelmeasuring unit 2059.

The demodulating unit 2053 demodulates the reception signal for themodulation symbol of the downlink channel using a modulation scheme suchas BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. The demodulating unit 2053performs separation and demodulation of a MIMO multiplexed downlinkchannel.

The decoding unit 2051 performs a decoding process on encoded bits ofthe demodulated downlink channel. The decoded downlink data and/ordownlink control information are output to the control unit 203. Thedecoding unit 2051 performs a decoding process on the PDSCH for eachtransport block.

The channel measuring unit 2059 measures the estimation value, a channelquality, and/or the like of the propagation path from the downlinkreference signal input from the demultiplexing unit 2055, and outputsthe estimation value, a channel quality, and/or the like of thepropagation path to the demultiplexing unit 2055 and/or the control unit203. The downlink reference signal used for measurement by the channelmeasuring unit 2059 may be decided on the basis of at least atransmission mode set by the RRC parameter and/or other RRC parameters.For example, the estimation value of the propagation path for performingthe propagation path compensation on the PDSCH or the EPDCCH is measuredthrough the DL-DMRS. The estimation value of the propagation path forperforming the propagation path compensation on the PDCCH or the PDSCHand/or the downlink channel for reporting the CSI are measured throughthe CRS. The downlink channel for reporting the CSI is measured throughthe CSI-RS. The channel measuring unit 2059 calculates a referencesignal received power (RSRP) and/or a reference signal received quality(RSRQ) on the basis of the CRS, the CSI-RS, or the discovery signal, andoutputs the RSRP and/or the RSRQ to the higher layer processing unit201.

The transmitting unit 207 performs a transmission process such asencoding, modulation, and multiplexing on the uplink control informationand the uplink data input from the higher layer processing unit 201under the control of the control unit 203. For example, the transmittingunit 207 generates and multiplexes the uplink channel such as the PUSCHor the PUCCH and/or the uplink reference signal, and generates atransmission signal. Further, the transmission process in thetransmitting unit 207 is performed on the basis of a setting which isspecified in advance or a setting set or notified from the base stationdevice 1.

The encoding unit 2071 encodes the HARQ indicator (HARQ-ACK), the uplinkcontrol information, and the uplink data input from the control unit 203using a predetermined coding scheme such as block coding, convolutionalcoding, turbo coding, or the like. The modulating unit 2073 modulatesthe encoded bits input from the encoding unit 2071 using a predeterminedmodulation scheme such as BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. Theuplink reference signal generating unit 2079 generates the uplinkreference signal on the basis of an RRC parameter set in the terminaldevice 2, and the like. The multiplexing unit 2075 multiplexes amodulated symbol and the uplink reference signal of each channel andarranges resulting data in a predetermined resource element.

The wireless transmitting unit 2077 performs processes such asconversion into a signal in the time domain by inverse fast Fouriertransform (IFFT), addition of the guard interval, generation of abaseband digital signal, conversion in an analog signal, quadraturemodulation, conversion from a signal of an intermediate frequency into asignal of a high frequency (up conversion), removal of an extrafrequency component, and amplification of power on the signal from themultiplexing unit 2075, and generates a transmission signal. Thetransmission signal output from the wireless transmitting unit 2077 istransmitted through the transceiving antenna 209.

<Signaling of Control Information in Present Embodiment>

The base station device 1 and the terminal device 2 can use variousmethods for signaling (notification, broadcasting, or setting) of thecontrol information. The signaling of the control information can beperformed in various layers (layers). The signaling of the controlinformation includes signaling of the physical layer which is signalingperformed through the physical layer, RRC signaling which is signalingperformed through the RRC layer, and MAC signaling which is signalingperformed through the MAC layer. The RRC signaling is dedicated RRCsignaling for notifying the terminal device 2 of the control informationspecific or a common RRC signaling for notifying of the controlinformation specific to the base station device 1. The signaling used bya layer higher than the physical layer such as RRC signaling and MACsignaling is also referred to as signaling of the higher layer.

The RRC signaling is implemented by signaling the RRC parameter. The MACsignaling is implemented by signaling the MAC control element. Thesignaling of the physical layer is implemented by signaling the downlinkcontrol information (DCI) or the uplink control information (UCI). TheRRC parameter and the MAC control element are transmitted using thePDSCH or the PUSCH. The DCI is transmitted using the PDCCH or theEPDCCH. The UCI is transmitted using the PUCCH or the PUSCH. The RRCsignaling and the MAC signaling are used for signaling semi-staticcontrol information and are also referred to as semi-static signaling.The signaling of the physical layer is used for signaling dynamiccontrol information and also referred to as dynamic signaling. The DCIis used for scheduling of the PDSCH or scheduling of the PUSCH. The UCIis used for the CSI report, the HARQ-ACK report, and/or the schedulingrequest (SR).

<Details of Downlink Control Information in Present Embodiment>

The DCI is notified using the DCI format having a field which isspecified in advance. Predetermined information bits are mapped to thefield specified in the DCI format. The DCI notifies of downlinkscheduling information, uplink scheduling information, sidelinkscheduling information, a request for a non-periodic CSI report, or anuplink transmission power command.

The DCI format monitored by the terminal device 2 is decided inaccordance with the transmission mode set for each serving cell. Inother words, a part of the DCI format monitored by the terminal device 2can differ depending on the transmission mode. For example, the terminaldevice 2 in which a downlink transmission mode 1 is set monitors the DCIformat 1A and the DCI format 1. For example, the terminal device 2 inwhich a downlink transmission mode 4 is set monitors the DCI format 1Aand the DCI format 2. For example, the terminal device 2 in which anuplink transmission mode 1 is set monitors the DCI format 0. Forexample, the terminal device 2 in which an uplink transmission mode 2 isset monitors the DCI format 0 and the DCI format 4.

A control region in which the PDCCH for notifying the terminal device 2of the DCI is placed is not notified of, and the terminal device 2detects the DCI for the terminal device 2 through blind decoding (blinddetection). Specifically, the terminal device 2 monitors a set of PDCCHcandidates in the serving cell. The monitoring indicates that decodingis attempted in accordance with all the DCI formats to be monitored foreach of the PDCCHs in the set. For example, the terminal device 2attempts to decode all aggregation levels, PDCCH candidates, and DCIformats which are likely to be transmitted to the terminal device 2. Theterminal device 2 recognizes the DCI (PDCCH) which is successfullydecoded (detected) as the DCI (PDCCH) for the terminal device 2.

A cyclic redundancy check (CRC) is added to the DCI. The CRC is used forthe DCI error detection and the DCI blind detection. A CRC parity bit(CRC) is scrambled using the RNTI. The terminal device 2 detects whetheror not it is a DCI for the terminal device 2 on the basis of the RNTI.Specifically, the terminal device 2 performs de-scrambling on the bitcorresponding to the CRC using a predetermined RNTI, extracts the CRC,and detects whether or not the corresponding DCI is correct.

The RNTI is specified or set in accordance with a purpose or a use ofthe DCI. The RNTI includes a cell-RNTI (C-RNTI), a semi persistentscheduling C-RNTI (SPS C-RNTI), a system information-RNTI (SI-RNTI), apaging-RNTI (P-RNTI), a random access-RNTI (RA-RNTI), a transmit powercontrol-PUCCH-RNTI (TPC-PUCCH-RNTI), a transmit power control-PUSCH-RNTI(TPC-PUSCH-RNTI), a temporary C-RNTI, a multimedia broadcast muticastservices (MBMS)-RNTI (M-RNTI)), and an eIMTA-RNTI.

The C-RNTI and the SPS C-RNTI are RNTIs which are specific to theterminal device 2 in the base station device 1 (cell), and serve asidentifiers identifying the terminal device 2. The C-RNTI is used forscheduling the PDSCH or the PUSCH in a certain sub frame. The SPS C-RNTIis used to activate or release periodic scheduling of resources for thePDSCH or the PUSCH. A control channel having a CRC scrambled using theSI-RNTI is used for scheduling a system information block (SIB). Acontrol channel with a CRC scrambled using the P-RNTI is used forcontrolling paging. A control channel with a CRC scrambled using theRA-RNTI is used for scheduling a response to the RACH. A control channelhaving a CRC scrambled using the TPC-PUCCH-RNTI is used for powercontrol of the PUCCH. A control channel having a CRC scrambled using theTPC-PUSCH-RNTI is used for power control of the PUSCH. A control channelwith a CRC scrambled using the temporary C-RNTI is used by a mobilestation device in which no C-RNTI is set or recognized. A controlchannel with CRC scrambled using the M-RNTI is used for scheduling theMBMS. A control channel with a CRC scrambled using the eIMTA-RNTI isused for notifying of information related to a TDD UL/DL setting of aTDD serving cell in dynamic TDD (eIMTA). Further, the DCI format may bescrambled using a new RNTI instead of the above RNTI.

Scheduling information (the downlink scheduling information, the uplinkscheduling information, and the sidelink scheduling information)includes information for scheduling in units of resource blocks orresource block groups as the scheduling of the frequency region. Theresource block group is successive resource block sets and indicatesresources allocated to the scheduled terminal device. A size of theresource block group is decided in accordance with a system bandwidth.

<Details of Channel State Information in Present Embodiment>

The terminal device 2 reports the CSI to the base station device 1. Thetime and frequency resources used to report the CSI are controlled bythe base station device 1. In the terminal device 2, a setting relatedto the CSI is performed through the RRC signaling from the base stationdevice 1. In the terminal device 2, one or more CSI processes are set ina predetermined transmission mode. The CSI reported by the terminaldevice 2 corresponds to the CSI process. For example, the CSI process isa unit of control or setting related to the CSI. For each of the CSIprocesses, a setting related to the CSI-RS resources, the CSI-IMresources, the periodic CSI report (for example, a period and an offsetof a report), and/or the non-periodic CSI report can be independentlyset.

The CSI includes a channel quality indicator (CQI), a precoding matrixindicator (PMI), a precoding type indicator (PTI), a rank indicator(RI), and/or a CSI-RS resource indicator (CRI). The RI indicates thenumber of transmission layers (the number of ranks). The PMI isinformation indicating a precoding matrix which is specified in advance.The PMI indicates one precoding matrix by one piece of information ortwo pieces of information. In a case in which two pieces of informationare used, the PMI is also referred to as a first PMI and a second PMI.The CQI is information indicating a combination of a modulation schemeand a coding rate which are specified in advance. The CRI is information(single instance) indicating one CSI-RS resource selected from two ormore CSI-RS resources in a case in which the two or more CSI-RSresources are set in one CSI process. The terminal device 2 reports theCSI to recommend to the base station device 1. The terminal device 2reports the CQI satisfying a predetermined reception quality for eachtransport block (codeword).

In the CRI report, one CSI-RS resource is selected from the CSI-RSresources to be set. In a case in which the CRI is reported, the PMI,the CQI, and the RI to be reported are calculated (selected) on thebasis of the reported CRI. For example, in a case in which the CSI-RSresources to be set are precoded, the terminal device 2 reports the CRI,so that precoding (beam) suitable for the terminal device 2 is reported.

A sub frame (reporting instances) in which periodic CSI reporting can beperformed are decided by a report period and a sub frame offset set by aparameter of a higher layer (a CQIPMI index, an RI index, and a CRIindex). Further, the parameter of the higher layer can be independentlyset in a sub frame set to measure the CSI. In a case in which only onepiece of information is set in a plurality of sub frame sets, thatinformation can be set in common to the sub frame sets. In each servingcell, one or more periodic CSI reports are set by the signaling of thehigher layer.

A CSI report type supports a PUCCH CSI report mode. The CSI report typeis also referred to as a PUCCH report type. A type 1 report supportsfeedback of the CQI for a terminal selection sub band. A type 1a reportsupports feedbank of a sub band CQI and a second PMI. Type 2, type 2b,type 2c reports support feedback of a wideband CQI and a PMI. A type 2areport supports feedbank of a wideband PMI. A type 3 report supportsfeedback of the RI. A type 4 report supports feedback of the widebandCQI. A type 5 report supports feedback of the RI and the wideband PMI. Atype 6 report supports feedback of the RI and the PTI. A type 7 reportsupports feedback of the CRI and the RI. A type 8 report supportsfeedback of the CRI, the RI, and the wideband PMI. A type 9 reportsupports feedback of the CRI, the RI, and the PTI. A type 10 reportsupports feedback of the CRI.

In the terminal device 2, information related to the CSI measurement andthe CSI report is set from the base station device 1. The CSImeasurement is performed on the basis of the reference signal and/or thereference resources (for example, the CRS, the CSI-RS, the CSI-IMresources, and/or the DRS). The reference signal used for the CSImeasurement is decided on the basis of the setting of the transmissionmode or the like. The CSI measurement is performed on the basis ofchannel measurement and interference measurement. For example, power ofa desired cell is measured through the channel measurement. Power andnoise power of a cell other than a desired cell are measured through theinterference measurement.

For example, in the CSI measurement, the terminal device 2 performs thechannel measurement and the interference measurement on the basis of theCRS. For example, in the CSI measurement, the terminal device 2 performsthe channel measurement on the basis of the CSI-RS and performs theinterference measurement on the basis of the CRS. For example, in theCSI measurement, the terminal device 2 performs the channel measurementon the basis of the CSI-RS and performs the interference measurement onthe basis of the CSI-IM resources.

The CSI process is set as information specific to the terminal device 2through signaling of the higher layer. In the terminal device 2, one ormore CSI processes are set, and the CSI measurement and the CSI reportare performed on the basis of the setting of the CSI process. Forexample, in a case in which a plurality of CSI processes are set, theterminal device 2 independently reports a plurality of CSIs based on theCSI processes. Each CSI process includes a setting for the cell stateinformation, an identifier of the CSI process, setting informationrelated to the CSI-RS, setting information related to the CSI-IM, a subframe pattern set for the CSI report, setting information related to theperiodic CSI report, setting information related to the non-periodic CSIreport. Further, the setting for the cell state information may becommon to a plurality of CSI processes.

The terminal device 2 uses the CSI reference resources to perform theCSI measurement. For example, the terminal device 2 measures the CSI ina case in which the PDSCH is transmitted using a group of downlinkphysical resource blocks indicated by the CSI reference resources. In acase in which the CSI sub frame set is set through the signaling of thehigher layer, each CSI reference resource belongs to one of the CSI subframe sets and does not belong to both of the CSI sub frame sets.

In the frequency direction, the CSI reference resource is defined by thegroup of downlink physical resource blocks corresponding to the bandsassociated with the value of the measured CQI.

In the layer direction (spatial direction), the CSI reference resourcesare defined by the RI and the PMI whose conditions are set by themeasured CQI. In other words, in the layer direction (spatialdirection), the CSI reference resources are defined by the RI and thePMI which are assumed or generated when the CQI is measured.

In the time direction, the CSI reference resources are defined by one ormore predetermined downlink sub frames. Specifically, the CSI referenceresources are defined by a valid sub frame which is a predeterminednumber before a sub frame for reporting the CSI. The predeterminednumber of sub frames for defining the CSI reference resources is decidedon the basis of the transmission mode, the frame configuration type, thenumber of CSI processes to be set, and/or the CSI report mode. Forexample, in a case in which one CSI process and the periodic CSI reportmode are set in the terminal device 2, the predetermined number of subframes for defining the CSI reference resource is a minimum value of 4or more among valid downlink sub frames.

A valid sub frame is a sub frame satisfying a predetermined condition. Adownlink sub frame in a serving cell is considered to be valid in a casein which some or all of the following conditions are satisfied.

-   (1) A valid downlink sub frame is a sub frame in an ON state in the    terminal device 2 in which the RRC parameters related to the ON    state and the OFF state are set;-   (2) A valid downlink sub frame is set as the downlink sub frame in    the terminal device 2;-   (3) A valid downlink sub frame is not a multimedia broadcast    multicast service single frequency network (MBSFN) sub frame in a    predetermined transmission mode;-   (4) A valid downlink sub frame is not included in a range of a    measurement interval (measurement gap) set in the terminal device 2;-   (5) A valid downlink sub frame is an element or part of a CSI sub    frame set linked to a periodic CSI report when the CSI sub frame set    is set in the terminal device 2 in the periodic CSI report; and-   (6) A valid downlink sub frame is an element or part of a CSI sub    frame set linked to a downlink sub frame associated with a    corresponding CSI request in an uplink DCI format in a non-periodic    CSI report for the CSI process. Under these conditions, a    predetermined transmission mode, a plurality of CSI processes, and a    CSI sub frame set for the CSI process are set in the terminal device    2.

<Details of Multicarrier Transmission in Present Embodiment>

A plurality of cells are set for the terminal device 2, and the terminaldevice 2 can perform multicarrier transmission. Communication in whichthe terminal device 2 uses a plurality of cells is referred to ascarrier aggregation (CA) or dual connectivity (DC). Contents describedin the present embodiment can be applied to each or some of a pluralityof cells set in the terminal device 2. The cell set in the terminaldevice 2 is also referred to as a serving cell.

In the CA, a plurality of serving cells to be set includes one primarycell (PCell) and one or more secondary cells (SCell).

One primary cell and one or more secondary cells can be set in theterminal device 2 that supports the CA.

The primary cell is a serving cell in which the initial connectionestablishment procedure is performed, a serving cell that the initialconnection re-establishment procedure is started, or a cell indicated asthe primary cell in a handover procedure. The primary cell operates witha primary frequency. The secondary cell can be set after a connection isconstructed or reconstructed. The secondary cell operates with asecondary frequency. Further, the connection is also referred to as anRRC connection.

The DC is an operation in which a predetermined terminal device 2consumes radio resources provided from at least two different networkpoints. The network point is a master base station device (a master eNB(MeNB)) and a secondary base station device (a secondary eNB (SeNB)). Inthe dual connectivity, the terminal device 2 establishes an RRCconnection through at least two network points. In the dualconnectivity, the two network points may be connected through anon-ideal backhaul.

In the DC, the base station device 1 which is connected to at least anS1-MME and plays a role of a mobility anchor of a core network isreferred to as a master base station device. Further, the base stationdevice 1 which is not the master base station device providingadditional radio resources to the terminal device 2 is referred to as asecondary base station device. A group of serving cells associated withthe master base station device is also referred to as a master cellgroup (MCG). A group of serving cells associated with the secondary basestation device is also referred to as a secondary cell group (SCG).

In the DC, the primary cell belongs to the MCG. Further, in the SCG, thesecondary cell corresponding to the primary cell is referred to as aprimary secondary cell (PSCell). A function (capability and performance)equivalent to the PCell (the base station device constituting the PCell)may be supported by the PSCell (the base station device constituting thePSCell). Further, the PSCell may only support some functions of thePCell. For example, the PSCell may support a function of performing thePDCCH transmission using the search space different from the CSS or theUSS. Further, the PSCell may constantly be in an activation state.Further, the PSCell is a cell that can receive the PUCCH.

In the DC, a radio bearer (a date radio bearer (DRB)) and/or a signalingradio bearer (SRB) may be individually allocated through the MeNB andthe SeNB. A duplex mode may be set individually in each of the MCG(PCell) and the SCG (PSCell). The MCG (PCell) and the SCG (PSCell) maynot be synchronized with each other. A parameter (a timing advance group(TAG)) for adjusting a plurality of timings may be independently set inthe MCG (PCell) and the SCG (PSCell). In the dual connectivity, theterminal device 2 transmits the UCI corresponding to the cell in the MCGonly through MeNB (PCell) and transmits the UCI corresponding to thecell in the SCG only through SeNB (pSCell). In the transmission of eachUCI, the transmission method using the PUCCH and/or the PUSCH is appliedin each cell group.

The PUCCH and the PBCH (MIB) are transmitted only through the PCell orthe PSCell. Further, the PRACH is transmitted only through the PCell orthe PSCell as long as a plurality of TAGs are not set between cells inthe CG.

In the PCell or the PSCell, semi-persistent scheduling (SPS) ordiscontinuous transmission (DRX) may be performed.

In the secondary cell, the same DRX as the PCell or the PSCell in thesame cell group may be performed.

In the secondary cell, information/parameter related to a setting of MACis basically shared with the PCell or the PSCell in the same cell group.Some parameters may be set for each secondary cell. Some timers orcounters may be applied only to the PCell or the PSCell.

In the CA, a cell to which the TDD scheme is applied and a cell to whichthe FDD scheme is applied may be aggregated. In a case in which the cellto which the TDD is applied and the cell to which the FDD is applied areaggregated, the present disclosure can be applied to either the cell towhich the TDD is applied or the cell to which the FDD is applied.

The terminal device 2 transmits information indicating a combination ofbands in which the CA is supported by the terminal device 2 to the basestation device 1. The terminal device 2 transmits information indicatingwhether or not simultaneous transmission and reception are supported ina plurality of serving cells in a plurality of different bands for eachof band combinations to the base station device 1.

<Details of Resource Allocation in Present Embodiment>

The base station device 1 can use a plurality of methods as a method ofallocating resources of the PDSCH and/or the PUSCH to the terminaldevice 2. The resource allocation method includes dynamic scheduling,semi persistent scheduling, multi sub frame scheduling, and cross subframe scheduling.

In the dynamic scheduling, one DCI performs resource allocation in onesub frame. Specifically, the PDCCH or the EPDCCH in a certain sub frameperforms scheduling for the PDSCH in the sub frame. The PDCCH or theEPDCCH in a certain sub frame performs scheduling for the PUSCH in apredetermined sub frame after the certain sub frame.

In the multi sub frame scheduling, one DCI allocates resources in one ormore sub frames. Specifically, the PDCCH or the EPDCCH in a certain subframe performs scheduling for the PDSCH in one or more sub frames whichare a predetermined number after the certain sub frame. The PDCCH or theEPDCCH in a certain sub frame performs scheduling for the PUSCH in oneor more sub frames which are a predetermined number after the sub frame.The predetermined number can be set to an integer of zero or more. Thepredetermined number may be specified in advance and may be decided onthe basis of the signaling of the physical layer and/or the RRCsignaling. In the multi sub frame scheduling, consecutive sub frames maybe scheduled, or sub frames with a predetermined period may bescheduled. The number of sub frames to be scheduled may be specified inadvance or may be decided on the basis of the signaling of the physicallayer and/or the RRC signaling.

In the cross sub frame scheduling, one DCI allocates resources in onesub frame. Specifically, the PDCCH or the EPDCCH in a certain sub frameperforms scheduling for the PDSCH in one sub frame which is apredetermined number after the certain sub frame. The PDCCH or theEPDCCH in a certain sub frame performs scheduling for the PUSCH in onesub frame which is a predetermined number after the sub frame. Thepredetermined number can be set to an integer of zero or more. Thepredetermined number may be specified in advance and may be decided onthe basis of the signaling of the physical layer and/or the RRCsignaling. In the cross sub frame scheduling, consecutive sub frames maybe scheduled, or sub frames with a predetermined period may bescheduled.

In the semi-persistent scheduling (SPS), one DCI allocates resources inone or more sub frames. In a case in which information related to theSPS is set through the RRC signaling, and the PDCCH or the EPDCCH foractivating the SPS is detected, the terminal device 2 activates aprocess related to the SPS and receives a predetermined PDSCH and/orPUSCH on the basis of a setting related to the SPS. In a case in whichthe PDCCH or the EPDCCH for releasing the SPS is detected when the SPSis activated, the terminal device 2 releases (inactivates) the SPS andstops reception of a predetermined PDSCH and/or PUSCH. The release ofthe SPS may be performed on the basis of a case in which a predeterminedcondition is satisfied. For example, in a case in which a predeterminednumber of empty transmission data is received, the SPS is released. Thedata empty transmission for releasing the SPS corresponds to a MACprotocol data unit (PDU) including a zero MAC service data unit (SDU).

Information related to the SPS by the RRC signaling includes an SPSC-RNTI which is an SPN RNTI, information related to a period (interval)in which the PDSCH is scheduled, information related to a period(interval) in which the PUSCH is scheduled, information related to asetting for releasing the SPS, and/or a number of the HARQ process inthe SPS. The SPS is supported only in the primary cell and/or theprimary secondary cell.

<HARQ in Present Embodiment>

In the present embodiment, the HARQ has various features. The HARQtransmits and retransmits the transport block. In the HARQ, apredetermined number of processes (HARQ processes) are used (set), andeach process independently operates in accordance with a stop-and-waitscheme.

In the downlink, the HARQ is asynchronous and operates adaptively. Inother words, in the downlink, retransmission is constantly scheduledthrough the PDCCH. The uplink HARQ-ACK (response information)corresponding to the downlink transmission is transmitted through thePUCCH or the PUSCH. In the downlink, the PDCCH notifies of a HARQprocess number indicating the HARQ process and information indicatingwhether or not transmission is initial transmission or retransmission.

In the uplink, the HARQ operates in a synchronous or asynchronousmanner. The downlink HARQ-ACK (response information) corresponding tothe uplink transmission is transmitted through the PHICH. In the uplinkHARQ, an operation of the terminal device is decided on the basis of theHARQ feedback received by the terminal device and/or the PDCCH receivedby the terminal device. For example, in a case in which the PDCCH is notreceived, and the HARQ feedback is ACK, the terminal device does notperform transmission (retransmission) but holds data in a HARQ buffer.In this case, the PDCCH may be transmitted in order to resume theretransmission. Further, for example, in a case in which the PDCCH isnot received, and the HARQ feedback is NACK, the terminal deviceperforms retransmission nonadaptively through a predetermined uplink subframe. Further, for example, in a case in which the PDCCH is received,the terminal device performs transmission or retransmission on the basisof contents notified through the PDCCH regardless of content of the HARQfeedback.

Further, in the uplink, in a case in which a predetermined condition(setting) is satisfied, the HARQ may be operated only in an asynchronousmanner. In other words, the downlink HARQ-ACK is not transmitted, andthe uplink retransmission may constantly be scheduled through the PDCCH.

In the HARQ-ACK report, the HARQ-ACK indicates ACK, NACK, or DTX. In acase in which the HARQ-ACK is ACK, it indicates that the transport block(codeword and channel) corresponding to the HARQ-ACK is correctlyreceived (decoded). In a case in which the HARQ-ACK is NACK, itindicates that the transport block (codeword and channel) correspondingto the HARQ-ACK is not correctly received (decoded). In a case in whichthe HARQ-ACK is DTX, it indicates that the transport block (codeword andchannel) corresponding to the HARQ-ACK is not present (not transmitted).

A predetermined number of HARQ processes are set (specified) in each ofdownlink and uplink. For example, in FDD, up to eight HARQ processes areused for each serving cell. Further, for example, in TDD, a maximumnumber of HARQ processes is decided by an uplink/downlink setting. Amaximum number of HARQ processes may be decided on the basis of a roundtrip time (RTT). For example, in a case in which the RTT is 8 TTIs, themaximum number of the HARQ processes can be 8.

In the present embodiment, the HARQ information is constituted by atleast a new data indicator (NDI) and a transport block size (TBS). TheNDI is information indicating whether or not the transport blockcorresponding to the HARQ information is initial transmission orretransmission. The TBS is the size of the transport block. Thetransport block is a block of data in a transport channel (transportlayer) and can be a unit for performing the HARQ. In the DL-SCHtransmission, the HARQ information further includes a HARQ process ID (aHARQ process number). In the UL-SCH transmission, the HARQ informationfurther includes an information bit in which the transport block isencoded and a redundancy version (RV) which is information specifying aparity bit. In the case of spatial multiplexing in the DL-SCH, the HARQinformation thereof includes a set of NDI and TBS for each transportblock.

<Details of Downlink Resource Elements Mapping of NR in PresentEmbodiment>

Hereinafter, an example of downlink resource element mapping ofpredetermined resources in NR will be described.

Here, the predetermined resource may be referred to as an NR resourceblock (NR-RB) which is a resource block in NR. The predeterminedresource can be defined on the basis of a unit of allocation related toa predetermined channel or a predetermined signal such as the NR-PDSCHor the NR-PDCCH, a unit in which mapping of the predetermined channel orthe predetermined signal to a resource element is defined, and/or a unitin which the parameter set is set.

FIG. 10 is a diagram illustrating an example of the downlink resourceelement mapping of NR according to the present embodiment. FIG. 10illustrates a set of resource elements in the predetermined resources ina case in which parameter set 0 is used. The predetermined resourcesillustrated in FIG. 10 are resources formed by a time length and afrequency bandwidth such as one resource block pair in LTE.

In the example of FIG. 10 , the predetermined resources include 14 OFDMsymbols indicated by OFDM symbol numbers 0 to 13 in the time directionand 12 sub carriers indicated by sub carrier numbers 0 to 11 in thefrequency direction. In a case in which the system bandwidth includesthe plurality of predetermined resources, sub carrier numbers areallocated throughout the system bandwidth.

Resource elements indicated by C1 to C4 indicate reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. Resource elements indicated by D1 and D2 indicate DL-DMRS of CDMgroup 1 and CDM group 2, respectively.

FIG. 11 is a diagram illustrating an example of the downlink resourceelement mapping of NR according to the present embodiment. FIG. 11illustrates a set of resource elements in the predetermined resources ina case in which parameter set 1 is used. The predetermined resourcesillustrated in FIG. 11 are resources formed by the same time length andfrequency bandwidth as one resource block pair in LTE.

In the example of FIG. 11 , the predetermined resources include 7 OFDMsymbols indicated by OFDM symbol numbers 0 to 6 in the time directionand 24 sub carriers indicated by sub carrier numbers 0 to 23 in thefrequency direction. In a case in which the system bandwidth includesthe plurality of predetermined resources, sub carrier numbers areallocated throughout the system bandwidth.

Resource elements indicated by C1 to C4 indicate reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. Resource elements indicated by D1 and D2 indicate DL-DMRS of CDMgroup 1 and CDM group 2, respectively.

FIG. 12 is a diagram illustrating an example of the downlink resourceelement mapping of NR according to the present embodiment. FIG. 12illustrates a set of resource elements in the predetermined resources ina case in which parameter set 1 is used. The predetermined resourcesillustrated in FIG. 12 are resources formed by the same time length andfrequency bandwidth as one resource block pair in LTE.

In the example of FIG. 12 , the predetermined resources include 28 OFDMsymbols indicated by OFDM symbol numbers 0 to 27 in the time directionand 6 sub carriers indicated by sub carrier numbers 0 to 6 in thefrequency direction. In a case in which the system bandwidth includesthe plurality of predetermined resources, sub carrier numbers areallocated throughout the system bandwidth.

Resource elements indicated by C1 to C4 indicate reference signals(CSI-RS) for measuring transmission path states of the antenna ports 15to 22. Resource elements indicated by D1 and D2 indicate DL-DMRS of CDMgroup 1 and CDM group 2, respectively.

For example, in NR, reference signals equivalent to the CRS in LTE maynot transmitted.

<Details of Resource Element Mapping Method of NR in Present Embodiment>

As described above, in the present embodiment, physical signals withdifferent parameters related to the transmission signal illustrated inFIGS. 10 to 13 can be multiplexed by the FDM or the like in NR. Forexample, the multiplexing is performed using predetermined resources asa unit. Further, even in a case in which the base station device 1performing scheduling or the like recognizes the multiplexing, theterminal device terminal 2 may not recognize the multiplexing. Theterminal device 2 may recognize only a physical signal received ortransmitted by the terminal device 2 or may not recognize a physicalsignal not received or transmitted by the terminal device 2.

Further, parameters related to the transmission signal can be defined,set, or specified in the mapping to the resource elements. In NR, theresource element mapping can be performed using various methods. Notethat, in the present embodiment, a method of the resource elementmapping of NR will be described with regard to a downlink, but the samecan apply to an uplink and a sidelink.

A first mapping method related to the resource element mapping in NR isa method of setting or specifying parameters (physical parameters)related to the transmission signal in the predetermined resources.

In the first mapping method, parameters related to the transmissionsignal are set in the predetermined resources. The parameters related tothe transmission signal set in the predetermined resources include a subframe interval of the sub carriers in the predetermined resources, thenumber of sub carriers included in the predetermined resources, thenumber of symbols included in the predetermined resources, a CP lengthtype in the predetermined resources, a multiple access scheme used inthe predetermined resources, and/or a parameter set in the predeterminedresources.

For example, in the first mapping method, a resource grid in NR can bedefined with the predetermined resources.

FIG. 13 is a diagram illustrating an example of a resource elementmapping method of NR according to the present embodiment. In the exampleof FIG. 13 , one or more predetermined resources can undergo the FDM ina predetermined system bandwidth and a predetermined time region (subframe).

A bandwidth in the predetermined resources and/or a time length in thepredetermined resources can be specified in advance. For example, abandwidth in the predetermined resources corresponds to 180 kHz and atime length in the predetermined resources corresponds to 1 millisecond.That is, the predetermined resources correspond to the same bandwidthand time length as the resource block pair in LTE.

In addition, the bandwidth in the predetermined resources and/or thetime length in the predetermined resources can be set by RRC signaling.For example, the bandwidth in the predetermined resources and/or thetime length in the predetermined resources is set to be specific to thebase station device 1 (cell) on the basis of information included in theMIB or the SIB transmitted via a broadcast channel or the like. Further,for example, the bandwidth in the predetermined resources and/or thetime length in the predetermined resources is set to be specific to theterminal device 2 on the basis of control information specific to theterminal device 2.

In the first mapping method, the parameters related to the transmissionsignal set in the predetermined resources can be set by RRC signaling.For example, the parameters are set to be specific to the base stationdevice 1 (cell) on the basis of information included in the MIB or theSIB transmitted via a broadcast channel or the like. Further, forexample, the parameters are set to be specific to the terminal device 2on the basis of control information specific to the terminal device 2.

In the first mapping method, the parameters related to the transmissionsignal set in the predetermined resources are set on the basis of atleast one of the following methods or definitions.

-   (1) The parameters related to the transmission signal are set    individually in each of the predetermined resources.-   (2) The parameters related to the transmission signal are set    individually in each group of the predetermined resources. The group    of the predetermined resources is a set of the predetermined    resources successive in the frequency direction. The number of    predetermined resources included in the group may be specified in    advance or may be set by RRC signaling.-   (3) The predetermined resources in which certain parameters are set    are predetermined successive resources decided on the basis of    information indicating a starting predetermined resource and/or    ending predetermined resource. The information can be set by RRC    signaling.-   (4) The predetermined resource in which a certain parameter is set    is indicated by information regarding a bit map. For example, each    bit included in the information regarding a bit map corresponds to    the predetermined resource or a group of the predetermined    resources. In a case in which the bit included in the information    regarding the bit map is 1, the parameter is set in the    predetermined resource or the group of the predetermined resources    corresponding to the bit. The information regarding the bit map can    be set by RRC signaling.-   (5) In the predetermined resource to which a predetermined signal or    a predetermined channel is mapped (transmitted), a parameter    specified in advance is used. For example, in the predetermined    resource in which a synchronization signal or a broadcast channel is    transmitted, a parameter specified in advance is used. For example,    the parameter specified in advance corresponds to the same bandwidth    and time length as the resource block pair in LTE.-   (6) In a predetermined time region including the predetermined    resources in which the predetermined signals or the predetermined    channels are mapped (transmitted) (that is, all the predetermined    resources included in the predetermined time region), parameters    specified in advance are used. For example, in a sub frame including    a predetermined resource in which a synchronization signal or a    broadcast channel is transmitted, a parameter specified in advance    is used. For example, the parameter specified in advance corresponds    to the same bandwidth and time length as the resource block pair in    LTE.-   (7) In a predetermined resource in which a parameter is not set, a    parameter specified in advance is used. For example, in a    predetermined resource in which a parameter is not set, the same    parameter as the predetermined resource in which a synchronization    signal or a broadcast channel is transmitted is used.-   (8) In one cell (component carrier), parameters which can be set are    restricted. For example, for a sub carrier interval which can be set    in one cell, the bandwidth in the predetermined resources is a value    which is an integer multiple of the sub carrier interval.    Specifically, in a case in which the bandwidth in the predetermined    resources is 180 kHz, the sub carrier interval which can be set    includes 3.75 kHz, 7.5 kHz, 15 kHz, 30 kHz, and 60 kHz.

A second mapping method related to the resource element mapping in NR isa method based on sub resource elements used to define a resourceelement.

In the second mapping method, the sub resource elements are used tospecify, set, or define a resource element corresponding to a parameterrelated to the transmission signal. In the second mapping method, theresource element and the sub resource element are referred to as a firstelement and a second element, respectively.

In other words, in the second mapping method, the parameters (physicalparameters) related to the transmission signal are set on the basis ofthe setting related to the sub resource elements.

For example, in a predetermined resource, the number of sub resourceelements or a pattern of the sub resource elements included in oneresource element is set. Further, the predetermined resources can be setto be the same as the predetermined resources described in the presentembodiment.

For example, in the second mapping method, a resource grid in NR can bedefined with a predetermined number of sub resource elements.

FIG. 14 is a diagram illustrating an example of a resource elementmapping method of NR according to the present embodiment. In the exampleof FIG. 14 , each predetermined resource includes 28 sub resourceelements in the time direction and 24 sub resource elements in thefrequency direction. That is, in a case in which the frequency bandwidthin the predetermined resources is 180 kHz, the frequency bandwidth inthe sub resource elements is 7.5 kHz.

A bandwidth in the sub resource elements and/or a time length in the subresource elements can be specified in advance. Further, for example, thesub resource elements correspond to the same bandwidth (15 kHz) and timelength as the sub resource elements in LTE.

In addition, the bandwidth in the sub resource elements and/or the timelength in the sub resource elements can be set by RRC signaling. Forexample, the bandwidth in the sub resource elements and/or the timelength in the sub resource elements are set to be specific to the basestation device 1 (cell) on the basis of information included in the MIBor the SIB transmitted via a broadcast channel or the like. Further, forexample, the bandwidth in the sub resource elements and/or the timelength in the sub resource elements is set to be specific to theterminal device 2 on the basis of control information specific to theterminal device 2. Further, in a case in which the bandwidth in the subresource elements and/or the time length in the sub resource elements isnot set, the sub resource elements can correspond to the same bandwidth(15 kHz) and time length as the sub resource elements in LTE.

In the second mapping method, the sub resource elements included in oneresource element can be set on the basis of at least one of thefollowing methods or definitions.

-   (1) The setting is performed individually for each predetermined    resource.-   (2) The setting is performed individually for each group of the    predetermined resources. The group of the predetermined resources is    a set of the predetermined resources successive in the frequency    direction. The number of predetermined resources included in the    group may be specified in advance or may be set by RRC signaling.-   (3) The predetermined resources on which the setting is performed    are predetermined successive resources decided on the basis of    information indicating a starting predetermined resource and/or    ending predetermined resource. The information can be set by RRC    signaling.-   (4) The predetermined resource on which the setting is performed is    indicated by information regarding a bit map. For example, each bit    included in the information regarding a bit map corresponds to the    predetermined resource or a group of the predetermined resources. In    a case in which the bit included in the information regarding the    bit map is 1, the setting is performed on the predetermined resource    or the group of the predetermined resources corresponding to the    bit. The information regarding the bit map can be set by RRC    signaling.-   (5) In the predetermined resource to which a predetermined signal or    a predetermined channel is mapped (transmitted), the sub resource    elements included in one resource element are specified in advance.    For example, in the predetermined resource in which a    synchronization signal or a broadcast channel is transmitted, the    sub resource elements included in one resource element are specified    in advance. For example, the sub resource elements specified in    advance correspond to the same bandwidth and time length as the    resource elements in LTE.-   (6) In a predetermined time region including the predetermined    resources in which the predetermined signals or the predetermined    channels are mapped (transmitted) (that is, all the predetermined    resources included in the predetermined time region), the sub    resource elements included in one resource element are specified in    advance. For example, in a predetermined time region including the    predetermined resources in which a synchronization signal or a    broadcast channel is transmitted, the sub resource elements included    in one resource element are specified in advance. For example, the    sub resource elements specified in advance correspond to the same    bandwidth and time length as the resource elements in LTE.-   (7) In the predetermined resources in which the setting is not    performed, the sub resource elements included in one resource    element are specified in advance. For example, in the predetermined    resources in which the setting is not performed, the sub resource    elements included in one resource element are the same sub resource    elements used in the predetermined resource in which a    synchronization signal or a broadcast channel is transmitted.-   (8) The setting is the number of sub resource elements included in    one resource element. The number of sub resource elements included    in one resource element in the frequency direction and/or the time    direction is set. For example, the sub resource elements are    considered to be set as in FIG. 14 . In a case in which 1 resource    element includes 2 sub resource elements in the frequency direction    and 2 sub resource elements in the time direction in the    predetermined resource, the predetermined resource includes 12 sub    carriers and 14 symbols. This configuration (setting) is the same as    the number of sub carriers and the number of symbols included in the    resource block pair in LTE and is suitable for a use case of eMBB.    Further, in a case in which 1 resource element includes 4 sub    resource elements in the frequency direction and 1 sub resource    element in the time direction in the predetermined resource, the    predetermined resource includes 6 sub carriers and 28 symbols. This    configuration (setting) is suitable for a use case of URLLC.    Further, in a case in which 1 resource element includes 1 sub    resource element in the frequency direction and 4 sub resource    elements in the time direction in the predetermined resource, the    predetermined resource includes 24 sub carriers and 7 symbols. This    configuration (setting) is suitable for a use case of mMTC.-   (9) The number of sub resource elements included in one resource    element described in the foregoing (8) is patterned in advance and    information (an index) indicating the pattern is used for the    setting. The pattern can include a CP length type, definition of the    sub resource elements, a multiple access scheme, and/or a parameter    set.-   (10) In one cell (component carrier) or one time region (sub frame),    the number of sub resource elements included in one resource element    is constant. For example, in one cell or one time region, all the    number of sub resource elements included in one resource element is    4 as in the example described in the foregoing (8). That is, in the    example, it is possible to configure the resource element of the    bandwidth and the time length in which the number of sub resource    elements included in one resource element is 4.

Note that in the description of the present embodiment, thepredetermined resource has been used for the resource element mapping ina downlink, an uplink, or a sidelink in NR, as described above. However,the present disclosure is not limited thereto. The predeterminedresource may be used for resource element mapping in two or more linksamong a downlink, an uplink, and a sidelink.

For example, the predetermined resource is used for resource elementmapping in the downlink, the uplink, and the sidelink. In a certainpredetermined resource, a predetermined number of front symbols is usedfor resource element mapping in the downlink. In the predeterminedresource, a predetermined number of rear symbols is used for resourceelement mapping in the uplink. In the predetermined resource, apredetermined number of symbols between the predetermined number offront symbols and the predetermined number of rear symbols may be usedfor a guard period. In the predetermined resource, with regard to thepredetermined number of front symbols and the predetermined number ofrear symbols, the same physical parameters may be used or independentlyset physical parameters may be used.

Note that in the description of the present embodiment, the downlink,the uplink, and the sidelink have been described as the independentlydefined links in NR, but the present disclosure is not limited thereto.The downlink, the uplink, and the sidelink may be defined as a commonlink. For example, the channels, the signals, the processes, and/or theresources and the like described in the present embodiment are definedirrespective of the downlink, the uplink, and the sidelink. In the basestation device 1 or the terminal device 2, the channels, the signals,the processes, and/or the resource, and the like are decided on thebasis of the setting specified in advance, the setting by RRC signaling,and/or the control information in the physical layer. For example, inthe terminal device 2, channels and signals which can be transmitted andreceived are decided on the basis of setting form the base stationdevice 1.

<Frame Configuration of NR in Present Embodiment>

In NR, a physical channel and/or a physical signal can be transmitted byself-contained transmission. FIG. 15 illustrates an example of a frameconfiguration of the self-contained transmission in the presentembodiment. In the self-contained transmission, single transceivingincludes successive downlink transmission, a guard period (GP), andsuccessive downlink transmission from the head in that order. Thesuccessive downlink transmission includes at least one piece of downlinkcontrol information and the DMRS. The downlink control information givesan instruction to receive a downlink physical channel included in thesuccessive downlink transmission and to transmit an uplink physicalchannel included in the successive uplink transmission. In a case inwhich the downlink control information gives an instruction to receivethe downlink physical channel, the terminal device 2 attempts to receivethe downlink physical channel on the basis of the downlink controlinformation. Then, the terminal device 2 transmits success or failure ofreception of the downlink physical channel (decoding success or failure)by an uplink control channel included in the uplink transmissionallocated after the GP. On the other hand, in a case in which thedownlink control information gives an instruction to transmit the uplinkphysical channel, the uplink physical channel transmitted on the basisof the downlink control information is included in the uplinktransmission to be transmitted. In this way, by flexibly switchingbetween transmission of uplink data and transmission of downlink data bythe downlink control information, it is possible to take countermeasuresinstantaneously to increase or decrease a traffic ratio between anuplink and a downlink. Further, by notifying of the success or failureof the reception of the downlink by the uplink transmission immediatelyafter the success or failure of reception of the downlink, downlinkcommunication with low delay can be realized.

A unit slot time is a minimum time unit in which downlink transmission,a GP, uplink transmission, or sidelink transmission is defined. The unitslot time is reserved for one of the downlink transmission, the GP, theuplink transmission, or the sidelink transmission. In the unit slottime, both a predetermined downlink transmission and a predetermineduplink transmission can be included. For example, a certain unit slottime includes a certain downlink transmission and an uplink transmissionfor an HARQ-ACK in response to the downlink transmission. The unit slottime may be a minimum transmission time of a channel associated with theDMRS included in the unit slot time. One unit slot time is defined as,for example, an integer multiple of a sampling interval (T_(s)) or thesymbol length of NR.

The unit frame time may be a minimum time designated by scheduling. Theunit frame time may be a minimum unit in which a transport block istransmitted. The unit slot time may be a maximum transmission time of achannel associated with the DMRS included in the unit slot time. Theunit frame time may be a unit time in which the uplink transmissionpower in the terminal device 2 is decided. The unit frame time may bereferred to as a sub frame. In the unit frame time, there are threetypes of only the downlink transmission, only the uplink transmission,and a combination of the uplink transmission and the downlinktransmission. One unit frame time is defined as, for example, an integermultiple of the sampling interval (T_(s)), the symbol length, or theunit slot time of NR.

A transceiving time is one transceiving time. A time (a gap) in whichneither the physical channel nor the physical signal is transmitted mayoccupy between one transceiving and another transceiving. The terminaldevice 2 may not average the CSI measurement between differenttransceiving. The transceiving time may be referred to as TTI. Onetransceiving time is defined as, for example, an integer multiple of thesampling interval (T_(s)), the symbol length, the unit slot time, or theunit frame time of NR.

Further, as in the second example and the third example of FIG. 15 , thesuccessive downlink transmission and the successive uplink transmissionmay be collectively scheduled with one control channel or may beindividually scheduled with a control channel transmitted within eachunit frame time. Further, in any case, the control channel can include atime length of the downlink transmission, a time length of the uplinktransmission, and/or a time length of the GP. Further, the controlchannel can include information regarding a timing of the uplinktransmission for the HARQ-ACK in response to a certain downlinktransmission.

2. Drone <2.1. Use Cases>

Various use cases of a drone are considered. Hereinafter, examples ofrepresentative use cases will be described.

- Entertainment

For example, a use case in which a bird’s-eye view photo, moving image,or the like is captured by mounting a camera on a drone is considered.In recent years, it has become possible to easily perform photographingfrom viewpoint at which photographing was difficult before, such asdynamic photographing of sports events or the like from the ground.

- Transportation

For example, a use case in which luggage is transported with a drone isconsidered. There is already a movement for starting a serviceintroduction.

- Public Safety

For example, a use case such as surveillance, criminal tracking, or thelike is considered. Previously, there was also a movement for starting aservice introduction.

- Informative

For example, a use case in which information is provided using a droneis considered. Research and development of a drone base station which isa drone operating as a base station are already being carried out. Thedrone base station can provide a wireless service to an area in which itis difficult to build an Internet circuit by providing the wirelessservice from the sky.

- Sensing

For example, a use case of measurement performed using a drone isconsidered. Since measurement previously performed by humans can nowalso be performed collectively by a drone, efficient measurement can beperformed.

- Worker

For example, a use case in which a drone is used as a labor force isconsidered. For example, utilization of a drone for pesticide sprayingor pollination in a variety of areas of the agricultural industry isexpected.

- Maintenance

For example, a use case in which maintenance is performed using a droneis considered. By using a drone, it is possible to perform maintenanceof a location such as the back of a bridge in which it is difficult forhumans to perform validation.

<2.2. Wireless Communication>

Utilization of a drone in the various cases has been examined above. Inorder to realize such use cases, various technical requests are imposedon the drone. Of the technical requests, communication can beexemplified particularly as an important request. Since a drone fliesfreely in 3-dimensional space, using wired communication is unrealisticand using wireless communication is assumed. Note that control (that is,remote manipulation) of a drone, supply of information from a drone, andthe like are considered as purposes of the wireless communication.

Communication by a drone is also referred to as drone to X (D2X) in somecases. Communication partners of a drone in the D2X communication areconsidered to be, for example, another drone, a cellular base station, aWi-Fi (registered trademark) access point, a television (TV) tower, asatellite, a road side unit (RSU), and a human (or a device carried by ahuman), and the like. A drone can be remotely manipulated via device todevice (D2D) communication with a device carried by a human. Further, adrone can also be connected to a cellular system or Wi-Fi forcommunication. In order to further broaden coverage, a drone may be aconnected to a network in which a broadcast system such as TV is used ora network in which satellite communication is used, for communication.In this way, forming various communication links in a drone isconsidered.

<2.3. Technical Problem>

In general, in cellular communication, in order for a base stationdevice and a terminal device to efficiently perform wirelesscommunication, the base station device preferably controls radioresources efficiently. Therefore, in LTE or the like of the related art,the terminal device reports (that is, feeds back) measurementinformation of a transmission path with the base station device and/orterminal device state information to the base station device. Then, thebase station device controls the radio resources on the basis of theinformation reported from the terminal device.

However, a structure for the feedback control performed in the pastcellular communication has been designed on the premise that a terminaldevice is used on the ground or in a building, that is, a terminaldevice is used in 2-dimensional space. In other words, the structure forthe feedback control performed in the past cellular communication maynot be said to be appropriate for a drone which flies freely in3-dimensional space. Hereinafter, this point will be described in detailwith reference to FIG. 16 .

FIG. 16 is an explanatory diagram illustrating a technical problemaccording to the present embodiment. As illustrated in FIG. 16 , a basestation device in cellular communication is designed so that radio wavessent out from an antenna are oriented downward. Therefore, a drone whichflies at a low altitude can perform wireless communication, but it maybe difficult for a drone flying at a high altitude to perform wirelesscommunication. Therefore, in a case in which the drone performs cellularcommunication in a wireless communication system of the related art, itis difficult to efficiently transmit data and use cases of the drone arealso restricted.

In this way, a structure in past cellular communication is notappropriate for a drone in some cases. Therefore, the structure of thecellular communication is preferably expanded for a drone. Accordingly,in the present embodiment, a structure for expanded measurement andreporting is provided for a drone serving as a terminal device toperform cellular communication.

3. Configuration Example <3.1. Configuration Example of System>

Hereinafter, an example of a configuration of a system according to thepresent embodiment will be described with reference to FIG. 17 .

FIG. 17 is an explanatory diagram illustrating an example of aconfiguration of a system according to the present embodiment. Asillustrated in FIG. 17 , the system according to the present embodimentincludes the base station devices 1 and the terminal device 2. Asillustrated in FIG. 17 , the terminal device 2 according to theembodiment is a drone. Hereinafter, the terminal device 2 is referred toas the drone 2. The base station devices 1 and the drone 2 supportcellular communication including LTE and NR, as described above. Thebase station devices 1A, 1B, and 1C operate cells 10A, 10B, and 10C,respectively, and provide wireless communication services to the drone 2in the cells. The drone 2 is connected to the base station devices 1 andperforms wireless communication. For example, the drone 2 can transmitand receive data in real time in broad coverage provided by cellularcommunication and can be controlled for an autonomous flight byperforming the cellular communication.

<3.2. Detailed Configuration Example of Each Device>

Next, more detailed configuration examples of the base station devices 1and the terminal device 2 according to the present embodiment will bedescribed with reference to FIGS. 18 and 19 .

FIG. 18 is a block diagram illustrating an example of a logicalconfiguration of the higher layer processing unit 101 of the basestation device 1 according to the embodiment. As illustrated in FIG. 18, the higher layer processing unit 101 of the base station device 1according to the embodiment includes a reference signal transmittingunit 1011 and a communication control unit 1013. The reference signaltransmitting unit 1011 has a function of controlling the downlinkreference signal generating unit 1079 and transmits a reference signalto the drone 2. The communication control unit 1013 has a function ofcontrolling communication with the drone 2. The functions of thereference signal transmitting unit 1011 and the communication controlunit 1013 will be described in detail below.

FIG. 19 is a block diagram illustrating an example of a logicalconfiguration of the drone 2 according to the present embodiment. Asillustrated in FIG. 19 , the drone 2 according to the embodimentincludes a flight device 210 in addition to the configurationillustrated in FIG. 9 . The flight device 210 is a device that has aflight ability, that is, can fly. The flight device 210 includes adriving unit 211, a battery unit 212, a sensor unit 213, and a flightcontrol unit 214.

The driving unit 211 performs driving for causing the drone 2 to fly.The driving unit 211 includes, for example, a motor, propeller, atransfer mechanism that transfers power of the motor to the propeller,and the like. The battery unit 212 supplies power to each constituentelement of the flight device 210. The sensor unit 213 senses variouskinds of information. For example, the sensor unit 213 includes a gyrosensor, an acceleration sensor, a positional information acquisitionunit (for example, a signal positioning unit of the global navigationsatellite system (GNSS)), an altitude sensor, a remaining batterysensor, a rotational sensor of the motor, and the like. The flightcontrol unit 214 performs control for causing the drone 2 to fly. Forexample, the flight control unit 214 controls the driving unit 211 onthe basis of sensor information obtained from the sensor unit 213 suchthat the drone 2 is caused to fly.

The higher layer processing unit 201 is connected to the flight device210. Then, the higher layer processing unit 201 includes an acquisitionunit 2011 and a measurement report control unit 2013. The acquisitionunit 2011 has a function of acquiring information regarding a flightfrom the flight device 210. The measurement report control unit 2013 hasa function of controlling a measurement report process on the basis ofinformation regarding the flight acquired by the acquisition unit 2011.The functions of the acquisition unit 2011 and the measurement reportcontrol unit 2013 will be described in detail below.

Note that each of the higher layer processing unit 101 and the higherlayer processing unit 201 may be realized as a processor, a circuit, anintegrated circuit, or the like.

4. Technical Features <4.1. Overview>

FIG. 20 is an explanatory diagram illustrating an overview of technicalfeatures according to the present embodiment. As illustrated in FIG. 20, the base station device 1 may perform wireless communication with thedrone 2A flying at a high altitude using an individually formed beam(that is, radio waves subjected to beam forming). In this way, thetechnical problem illustrated in FIG. 16 can be solved. On the otherhand, the base station device 1 may perform radio communication with adrone 2B flying at a low altitude using radio waves of the related artoriented downward. In this way, a wireless communication methodappropriate for the drone 2 can differ in accordance with an altitude atwhich the drone 2B flies.

The wireless communication method appropriate for the drone 2 can alsodiffer in accordance with a circumstance other than the altitude atwhich the drone 2 flies. For example, the wireless communication methodappropriate for the drone 2 can differ in accordance with informationregarding a flight of the drone 2 (hereinafter also referred to asflight-related information), such as a battery state, a position, aflight state, or the like in addition to the altitude.

That is, it is preferable to perform wireless communication inaccordance with the flight-related information of the drone 2.Accordingly, in the present embodiment, a structure of measurement andreporting in accordance with the flight-related information is providedto perform the wireless communication in accordance with theflight-related information.

Next, necessity for highly reliable communication of the drone 2 will bedescribed.

For example, to deal with an emergency instantaneously (that is, toperform remote control) in a case in which the drone 2 flies inaccordance with remote control or flies autonomously, the drone 2 canpreferably perform wireless communication normally. However, forexample, in a case in which the drone 2 is attached with radiointerference (jamming), the remote control can be difficult. Therefore,high reliability is necessary in wireless communication with the drone 2which flies.

FIG. 21 is a diagram illustrating an example of wireless communicationwith high reliability for the drone 2 according to the presentembodiment. As illustrated in FIG. 21 , the drone 2 may be connected tothe plurality of base station devices 1 (that is, the base stationdevices 1A to 1C). The drone 2 can perform wireless communication withthe base station devices 1A to 1C. For example, even in a case in whicha failure occurs in radio waves from the base station device 1A, thedrone 2 can continue the wireless communication with the base stationdevice 1B or 1C.

The base station devices 1A to 1C may use the same frequency band (forexample, a component carrier) or may use different frequency bands. In acase in which the base station devices 1A to 1C use the same frequencyband, the drone 2 can perform coordinate multi-point (CoMP)communication in which the same signal is received from the base stationdevices 1A to 1C. Note that, in CoMP communication, the drone 2 may notrecognize whether the same signal is transmitted from the base stationdevices 1A to 1C. Further, in a case in which the base station devices1A to 1C use the different frequency bands, the drone 2 can performcommunication by carrier aggregation or dual connectivity in which aplurality of frequency bands are set and data transmission is performed.Note that, in communication by carrier aggregation or dual connectivity,the drone 2 may not recognize that the plurality of set frequency bandscorrespond to the different base station devices 1.

Further, in a case in which the base station device 1 detectsinterference radio waves or a failure in a predetermined frequency band,the drones 2 may be informed individually or entirely of predeterminedcontrol information. The predetermined control information can includeinformation regarding a frequency band in which the interference radiowaves or the failure is detected, information regarding a frequency bandin which the interference radio waves or the failure is not detected,information regarding a position of a sending source of the interferenceradio waves, and/or information regarding connection or handover of thefrequency band in which the interference radio wave or the failure isdetected. Note that the base station device 1 may detect interferenceradio waves or a failure in a predetermined frequency band on the basisof measurement information reported from the drone 2.

Even in the highly reliable communication, it is important for the drone2 to be connected to each base station device 1. Accordingly, even inthe highly reliable communication, it is preferable to perform wirelesscommunication in accordance with the flight-related information of thedrone 2 and it is preferable to perform measurement and report inaccordance with the flight-related information.

<4.2. Flight-Related Information>

Hereinafter, the flight-related information which is informationregarding a flight of the drone 2 will be described in detail.

The flight-related information includes information measured, detected,searched, estimated, or recognized when the drone 2 is flying. Forexample, the flight-related information can include altitude informationregarding a flight of the drone 2, battery information regarding theflight, positional information regarding the flight, and/or stateinformation regarding the flight. The flight-related information mayinclude information in which a plurality of pieces of flight-relatedinformation are combined.

The altitude information regarding the flight can include informationregarding an altitude at which the drone 2 is currently flying,information regarding an altitude at which the drone 2 can fly (that is,a highest altitude and a lowest altitude), and information regarding aset altitude at which the drone 2 will fly from now, and the like. Forexample, the base station device 1 can determine whether a beam is to beformed in accordance with the altitude information of the drone 2.

The battery information regarding the flight can include informationregarding a current remaining battery of the drone 2 (that is, an amountof remaining power of the battery unit 212), information regarding atime in which the drone 2 can fly, information regarding a capacity ofthe battery unit 212, information regarding power consumed by the drone2, and the like. Further, the battery information of the drone caninclude an absolute value such as a capacity and an amount of power, arelative value such as a remaining amount of a battery capacity, andinformation based on a percentage, a level obtained throughpredetermined calculation, or the like. For example, a report frequencyof measurement information can be decreased to save battery in a case inwhich a remaining battery is small, or the report frequency ofmeasurement information can be increased conversely to prevent a hazardin a case in which a remaining battery is small.

The positional information regarding the flight can include informationregarding latitude and longitude, information indicating a relativeposition from a site such as the predetermined base station device 1 ora predetermined reference point, information indicating whether thedrone is within a predetermined area, and the like. For example, thereport frequency of the measurement information can be increased in acase in which the drone 2 is flying near a flight prohibition district.

The state information regarding the flight (hereinafter also referred toas flight state information) can include information indicating whetherthe drone 2 is flying or stopping, information indicating whether thedrone 2 is in a flight by manual maneuvering or a flight by automaticmaneuvering (autonomous flight), information indicating whether apropeller of the drone 2 is rotating, information indicating whether thedrone 2 is grounded on the land or the like, and the like. For example,the drone 2 can increase the report frequency of the measurementinformation during a flight and decrease the report frequency of themeasurement information during stop.

Further, the flight-related information can include informationregarding precision or probability of each piece of information such asaltitude information which depends on the drone 2 or an environment. Forexample, the precision or the probability which depends on the drone 2includes information based on precision of the sensor unit 213 includedin the drone 2. The information regarding the precision or theprobability which depends on the environment includes information basedon weather, temperature, a wind speed, or an atmospheric pressure.

<4.3. First Embodiment>

The present embodiment is a form in which whether measurementinformation is performed is controlled on the basis of theflight-related information. That is, the drone 2 starts (that is,triggers) a measurement process and/or a report process on the basis ofthe flight-related information. Specifically, the drone 2 performspredetermined measurement to generate measurement information by thetrigger based on the flight-related information and/or reports (ornotifies or transmits) the generated measurement information to the basestation device 1.

Measurement Report Process

The drone 2 (for example, the acquisition unit 2011) acquires theflight-related information from the flight device 210. Further, thedrone 2 (for example, the measurement report control unit 2013) controlsthe measurement report process on a reference signal transmitted fromthe base station device 1 on the basis of the acquired flight-relatedinformation. Specifically, the drone 2 controls a measurement process ofacquiring measurement information regarding the reference signal and areport process of reporting the acquired measurement information to thebase station device 1 on the basis of the flight-related information.Note that a message including the measurement information transmittedfrom the drone 2 to the base station device 1 is also referred to as amanagement report message.

On the other hand, the base station device 1 (for example, the referencesignal transmitting unit 1011) transmits a reference signal. Thereference signal may be transmitted using radio waves oriented downwardor may be transmitted using a beam formed individually setting the drone2 of a wireless communication partner as a target, as described abovewith reference to FIG. 20 . Note that the reference signal in which thebeam is used may be transmitted to follow movement of the drone 2 or maybe transmitted comprehensively in all the directions. Further, the basestation device 1 (for example, the communication control unit 1013)generates setting information regarding the measurement report processand notifies the drone 2 of the setting information. Then, the basestation device 1 (for example, the communication control unit 1013)controls a process based on measurement information reported from thedrone 2 which acquires the flight-related information and performs themeasurement report process on the reference signal on the basis of theacquired flight-related information. Note that the process based on themeasurement information of a control target includes control of radioresources used for communication with the drone 2, selection of achannel, setting of an encoding ratio, and the like.

Measurement Information

Hereinafter, a specific example of information which can be included inthe measurement information regarding the reference signal reported inthe measurement report process by the drone 2 will be described.

The measurement information can include information for radio resourcemanagement. The information for radio resource management can include,for example, radio resource management (RRM) information in LTE. Forexample, the RRM information can include reference signal received power(RSRP), a received signal strength indicator (RSSI), reference signalreceived quality (RSRQ), a signal to noise power ratio (SNR), and/or asignal to interference and noise power ratio (SINR).

The RSRP is defined as an average value of reception power of areference signal in a predetermined resource, and the reference signalis transmitted using the resource in a predetermined bandwidth of ameasurement target. For example, the RSRP is used to measure receptionpower of a signal transmitted from the base station device 1 which is atransmission source of the reference signal.

The RSSI is defined as all the reception power in all the resources of apredetermined region. The RSSI is reception power for all the signalsincluded in a resource of the measurement target and includes a signalfrom a serving cell (that is, the base station device 1 which isconnected), a signal from a non-serving cell (that is, the base stationdevice 1 which is not connected), adjacent channel interference, thermalnoise, and the like.

The RSRQ is defined as a ratio of a value based on the above-describedRSRP to a value based on the above-described RSSI. The RSRQ is used tomeasure quality of a signal transmitted from the base station 1 which isthe transmission source of the reference signal.

The SNR is defined as a ratio of the reception power of a signaltransmitted from the base station device 1 to noise power.

The SINR is defined as a ratio of the reception power of a signaltransmitted from the base station device 1 to interference power andnoise power.

Further, the measurement information can include channel stateinformation. The channel state information can include, for example,channel state information (CSI) information in LTE. For example, the CSIinformation can include a channel quality indicator (CQI), a precodingmatrix indicator (PMI), a precoding type indicator (PTI), a rankindicator (RI), and/or a CSI-RS resource inductor (CRI).

The CSI is generated on the basis of a predetermined reference signal.For example, the drone 2 measures a transmission path state using thereference signal set or notified of from the base station device 1 andgenerates the CSI on the basis of the measured transmission path state.The reference signal for generating the CSI includes a common referencesignal (CRS) which is a reference signal transmitted cell-specifically,a channel state information-reference signal (CSI-RS) set to be specificto a terminal device to measure the CSI. Moreover, in the generation ofthe CSI, a channel state information-interference measurement (CSI-IM)which is a resource for measuring interference power and noise power maybe further set and used.

Further, in the CSI, a plurality of processes can be simultaneously set.A process related to the CSI is also referred to as a CSI process. Forexample, the CSI processes can correspond to the CSI for the differentbase station devices 1 and the CSI for different beams.

The RI indicates the number of transmission layers (for example, thenumber of ranks or the number of space multiplexes).

The PMI is information indicating a precoding matrix which is specifiedin advance. The PMI indicates one precoding matrix using one piece ofinformation or two pieces of information. The PMIs in a case in whichtwo pieces of information are referred to as a first PMI and a secondPMI.

The CQI is information indicating a combination of an encoding ratio anda modulation scheme which is specified in advance. The drone 2 reportsthe CQI satisfying predetermined reception quality for each transportblock (for example, a codeword).

The CRI is information indicating one CSI-RS resource (for example, asingle instance) selected from the CSI-RS resources in a case in whichtwo or more CSI-RS resources are set in one CSI process. The drone 2reports information indicating the CSI-RS resource recommended to thebase station device 1.

Note that the measurement information can include a variety of pieces ofinformation in addition to the foregoing information. For example, themeasurement information can include a cell ID associated with thereference signal.

Trigger

The drone 2 (for example, the measurement report control unit 2013) canreport the measurement information on the basis of a variety oftriggers. For example, the drone 2 reports the measurement informationto the base station device 1 on the basis of whether a predeterminedcondition is satisfied. This can also be ascertained as being switchedbetween whether the drone 2 performs the measurement process and/or thereport process on the basis of whether the predetermined condition issatisfied. Specifically, the drone 2 controls whether the measurementinformation is reported to the base station device 1 on the basis of acomparison result of a threshold and a value based on predeterminedinformation. This threshold is also referred to as a trigger thresholdbelow. Hereinafter, a specific example of the trigger will be described.

- First Example

For example, the predetermined information related to the trigger may beflight-related information. That is, the drone 2 may report themeasurement information to the base station device 1 on the basis ofwhether the flight-related information satisfies the predeterminedcondition (that is, the comparison result of the trigger threshold andthe value based on the flight-related information). For example, thedrone 2 starts the measurement process and the report process in a casein which a predetermined condition such as a condition in which thevalue based on the flight-related information is greater than thetrigger threshold or less than the trigger threshold is satisfied.Specifically, the drone 2 may start the measurement process and thereport process in a case in which a current altitude exceeds a thresholdof an altitude. Note that the value based on the flight-relatedinformation may be the flight-related information or may be a valueprocessed (for example, statistically processed or the like) on thebasis of the flight-related information.

Further, the trigger threshold may be set on the basis of at least aninstruction from the base station device 1. For example, the basestation device 1 may transmit setting information indicating the triggerthreshold to be set to the drone 2. Further, the base station device 1may transmit a parameter for deciding the trigger threshold to be set tothe drone 2 and the drone 2 may set the trigger threshold on the basisof the parameter.

Hereinafter, an example of a flow of a process related to a firstexample will be described with reference to FIG. 22 .

FIG. 22 is a sequence diagram illustrating an example of the flow of thefirst example of the measurement report process performed in the systemaccording to the present embodiment. The base station device 1 and thedrone 2 are involved in this sequence. Note that in FIG. 22 , the higherlayer processing unit 201 and the flight control unit 214 are separatelyillustrated to clarify exchange of information in the drone 2. Note thata process performed by the higher layer processing unit 201 can includenot only a process related to a higher layer but also a process of aphysical layer.

As illustrated in FIG. 22 , the base station device 1 first transmitsthe setting information regarding the measurement report process to thedrone 2 (step S102). The setting information regarding the measurementreport process can include, for example, information regarding areference signal to be measured, information regarding a report method,and the like. Subsequently, the base station device 1 transmits thesetting information of the threshold (that is, the trigger threshold)regarding the flight-related information to the drone 2 (step S104).Note that the setting information of the threshold related to theflight-related information may be included in the setting informationregarding the measurement report process to be transmitted.Subsequently, the higher layer processing unit 201 of the drone 2acquires the flight-related information from the flight control unit 214of the drone 2 (step S106). On the other hand, the base station device 1transmits the reference signal to the drone 2 (step S108). Then, thedrone 2 controls the measurement report process on the basis of whetherthe predetermined condition is satisfied, that is, the comparison resultof the value based on the acquired flight-related information and thethreshold set by the base station device 1. For example, in a case inwhich the predetermined condition is satisfied, the drone 2 starts themeasurement process and the report process and transmits the measurementinformation to the base station device 1 (step S110). Conversely, in acase in which the predetermined condition is not satisfied, the drone 2does not perform the measurement process and the report process.

- Second Example

For example, the predetermined information related to the trigger may bemeasurement information regarding the reference signal. That is, thedrone 2 may report the measurement information to the base stationdevice 1 on the basis of whether the measurement information obtained byperforming the measurement process satisfies the predetermined condition(that is, the comparison result of the trigger threshold and the valuebased on the measurement information). For example, the drone 2 startsthe report process in the case in which the predetermined condition suchas the condition in which the value based on the measurement informationregarding the predetermined reference signal is greater than the triggerthreshold or less than the trigger threshold is satisfied. Specifically,the drone 2 may start the report process in a case in which the RSRPregarding the predetermined reference signal exceeds the thresholdrelated to the RSRP. In this case, the measurement information to bereported can include information (for example, a cell ID or the like)regarding the reference signal satisfying the predetermined condition.

Further, the trigger threshold may be set on the basis of at least theflight-related information. For example, the drone 2 may set the triggerthreshold autonomously using a parameter based on the flight-relatedinformation. Further, the drone 2 may set the trigger threshold usingtwo parameters, the flight-related information and the settinginformation regarding the trigger threshold received from the basestation device 1.

Hereinafter, an example of a flow of a process related to a secondexample will be described with reference to FIG. 23 .

FIG. 23 is a sequence diagram illustrating an example of the flow of thesecond example of the measurement report process performed in the systemaccording to the present embodiment. The base station device 1 and thedrone 2 are involved in this sequence. Note that in FIG. 23 , the higherlayer processing unit 201 and the flight control unit 214 are separatelyillustrated to clarify exchange of information in the drone 2. Note thata process performed by the higher layer processing unit 201 can includenot only a process related to a higher layer but also a process of aphysical layer.

As illustrated in FIG. 23 , the base station device 1 first transmitsthe setting information regarding the measurement report process to thedrone 2 (step S202). Subsequently, the base station device 1 transmitsthe setting information of the threshold (that is, the triggerthreshold) related to the measurement information to the drone 2 (stepS204). Note that the setting information of the threshold related to themeasurement information may be included in the setting informationregarding the measurement report process to be transmitted.Subsequently, the higher layer processing unit 201 of the drone 2acquires the flight-related information from the flight control unit 214of the drone 2 (step S206). On the other hand, the base station device 1transmits the reference signal to the drone 2 (step S208). Then, thedrone 2 controls the measurement report process on the basis of whetherthe measurement information obtained by performing the measurementprocess satisfies the predetermined condition, that is, the comparisonresult of the value based on the measurement information and the triggerthreshold set on the basis of at least flight-related information. Forexample, in a case in which the predetermined condition is satisfied,the drone 2 starts the report process and transmits the measurementinformation to the base station device 1 (step S210). Conversely, in acase in which the predetermined condition is not satisfied, the drone 2does not perform the report process.

- Third Example

In a third example, the trigger threshold in the second example is setby the base station device 1 rather than the drone 2. In this example,the base station device 1 (for example, the communication control unit1013) generates the setting information regarding the measurement reportprocess on the basis of the flight-related information received from thedrone 2 and notifies the drone 2 of the setting information. Inparticular, the setting information relates to a trigger for reportingthe measurement information.

Specifically, the base station device 1 decides the trigger threshold onthe basis of at least the flight-related information acquired from thedrone 2 and transmits the setting information including informationindicating the decided trigger threshold to the drone 2. Then, the drone2 sets the trigger threshold decided by the base station device 1 andcontrols whether the report process is performed on the basis of themeasurement information obtained by performing the measurement process.That is, the drone 2 reports the measurement information to the basestation device 1 on the basis of whether the measurement informationobtained by performing the measurement process satisfies thepredetermined condition (that is, the comparison result of the triggerthreshold and the value based on the measurement information). Forexample, the drone 2 starts the report process in the case in which thepredetermined condition such as the condition in which the value basedon the measurement information regarding the predetermined referencesignal is greater than the trigger threshold or less than the triggerthreshold is satisfied. Specifically, the drone 2 may start the reportprocess in a case in which the RSRP regarding the predeterminedreference signal exceeds the threshold related to the RSRP decided bythe base station device 1. In this case, the measurement information tobe reported can include information (for example, a cell ID or the like)regarding the reference signal satisfying the predetermined condition.

Hereinafter, an example of a flow of a process related to the thirdexample will be described with reference to FIG. 24 .

FIG. 24 is a sequence diagram illustrating an example of the flow of thethird example of the measurement report process performed in the systemaccording to the present embodiment. The base station device 1 and thedrone 2 are involved in this sequence. Note that in FIG. 24 , the higherlayer processing unit 201 and the flight control unit 214 are separatelyillustrated to clarify exchange of information in the drone 2. Note thata process performed by the higher layer processing unit 201 can includenot only a process related to a higher layer but also a process of aphysical layer.

As illustrated in FIG. 24 , the higher layer processing unit 201 of thedrone 2 acquires the flight-related information from the flight controlunit 214 of the drone 2 (step S302). Subsequently, the drone 2 transmitsthe flight-related information to the base station device 1 (step S304).Subsequently, the base station device 1 transmits the settinginformation regarding the measurement report process to the drone 2(step S306). Further, the base station device 1 transmits the settinginformation of the threshold (that is, the trigger threshold) related tothe measurement information and decided on the basis of theflight-related information received from the drone 2 to the drone 2(step S308). Note that the setting information of the threshold relatedto the measurement information may be included in the settinginformation regarding the measurement report process to be transmitted.Further, the base station device 1 transmits the reference signal to thedrone 2 (step S310). Then, the drone 2 controls the measurement reportprocess on the basis of whether the measurement information obtained byperforming the measurement process satisfies the predeterminedcondition, that is, the comparison result of the value based on themeasurement information and the trigger threshold decided by the basestation device 1. For example, in a case in which the predeterminedcondition is satisfied, the drone 2 starts the report process andtransmits the measurement information to the base station device 1 (stepS312). Conversely, in a case in which the predetermined condition is notsatisfied, the drone 2 does not perform the report process.

Report Method

Various report methods of a case in which the drone 2 reports themeasurement information on the basis of the trigger are considered.

For example, the measurement information may be reported using apredetermined uplink channel.

The predetermined uplink channel used to report the measurementinformation may be one uplink channel allocated by the base stationdevice 1. Specifically, in a case in which the drone 2 reports themeasurement information on the basis of the trigger, the drone 2 firsttransmits a scheduling request (SR) using a predetermined PUCCH torequest the base station device 1 to allocate a PUSCH. Subsequently, thebase station device 1 allocates the PUSCH to the drone 2 on the basis ofthe received SR. Then, the drone 2 reports the measurement informationusing the allocated PUSCH. According to this method, since the basestation device 1 allocates the resources as necessary, unnecessaryresources are not generated and frequency use efficiency can beimproved.

The predetermined uplink channel used to report the measurementinformation may be an uplink channel allocated to a semi-persistent. Inother words, the predetermined uplink channel used to report themeasurement information may be a plurality of uplink channels allocatedperiodically by the base station device 1. Specifically, the basestation device 1 periodically allocates a plurality of PUSCHs forreporting the measurement information at a predetermined interval. Thedrone 2 reports the measurement information using the allocated PUSCHs.According to this method, since the base station device 1 may nottransmit the PDCCHs for allocating the PUSCHs, an overhead of downlinkcontrol information can be caused to be reduced and a delay until reportof the measurement information can be caused to be reduced.

The predetermined uplink channel used to report the measurementinformation may be an uplink channel selected by the drone 2 (forexample, the measurement report control unit 2013) from a resource poolallocated by the base station device 1. Specifically, the base stationdevice 1 first sets the resource pool formed by resources which can beselected as the PUSCHs for reporting the measurement information in thedrone 2. Then, the drone 2 reports the measurement information using theresource selected on the basis of a predetermined method from the setresource pool as the PUSCHs. The base station device 1 can set the sameresource pool in the plurality of drones 2 (or the drones 2 and theterminal devices 2 which do not include the flight devices 210). Here,in a case in which the PUSCHs selected between the plurality of drones 2collide, the base station device 1 can receive the measurementinformation from each drone 2 by performing interference cancellation.Further, as a method of causing interference caused due to collision ofthe PUSCHs between the plurality of drones 2 to be reduced, a code or aninterleaver specific to each drone 2 is considered to be applied.According to the method of using the resource pool, since the basestation device 1 may not transmit the PDCCHs for allocating the PUSCHs,an overhead of downlink control information can be caused to be reducedand a delay until report of the measurement information can be caused tobe reduced. Further, since the resources can be shared between theplurality of drones 2, an improvement in the frequency use efficiencycan also be realized. Note that using the resource pool can also bereferred to as Grant-free.

<4.4. Second Embodiment>

The present embodiment is a form in which content of the measurementreport process is controlled on the basis of the flight-relatedinformation. That is, the drone 2 selects (that is, switches) thecontent of the measurement report process on the basis of theflight-related information.

Selection Standard

The drone 2 (for example, the measurement report control unit 2013)performs a measurement report process selected on the basis of theflight-related information. Specifically, the drone 2 performs themeasurement report process selected on the basis of the flight-relatedinformation from a plurality of measurement report processes ofselection candidates. For example, whether one of a first measurementreport process and a second measurement report process is performed maybe switched on the basis of whether the flight-related informationsatisfies the predetermined condition.Whether the flight-relatedinformation satisfies the predetermined condition may mean, for example,a comparison result of a threshold and a value based on theflight-related information. The threshold is also referred to as aswitching threshold below. Note that the number of measurement reportprocesses of the selection candidates is 3 or more. In this case, two ormore switching thresholds may be set.

Here, an selection entity of the measurement report process may be thebase station device 1 or may be the drone 2, as will be described below.The description will be made below assuming the drone 2 as the selectionentity, but similar description will be made even in a case in which thebase station device 1 serves as the selection entity.

For example, the drone 2 may select a measurement report process to beperformed on the basis of the altitude information. Specifically, thedrone 2 may select the first measurement report process in a case inwhich an altitude of the drone 2 is less than the switching threshold,and may select the second measurement report process in a case in whichthe altitude of the drone 2 is equal to or greater than the switchingthreshold. Thus, the drone 2 obeys, for example, a rule or the like inwhich the measurement process and/or the report process is restricted inaccordance with the altitude. Further, the drone 2 can select a moredetailed measurement report process at a low altitude at which acollision risk is considered to be relatively high, and can also selecta measurement report process in power consumption is low at a highaltitude at which the collision risk is considered to be relatively low.

For example, the drone 2 may select the measurement report process to beperformed on the basis of the battery information. Specifically, thedrone 2 may select the first measurement report process in a case inwhich the remaining battery is less than the switching threshold, andmay select the second measurement report process in a case in which theremaining battery is equal to or greater than the switching threshold.Thus, the drone 2 can prepare for an emergency by selecting the detailedmeasurement report process, for example, in a case in which theremaining battery is less.

For example, the drone 2 may select the measurement report process to beperformed on the basis of the positional information. Specifically, thedrone 2 may select the first measurement report process in a case inwhich the position of the drone 2 is within a predetermined area, andmay select the second measurement report process in a case in which theposition of the drone 2 is not within the predetermined area. Thus, forexample, in a case in which the drone 2 approaches a flight prohibitionarea, the drone 2 can select the more detailed measurement reportprocess so that the drone 2 does not invade the flight prohibition area.

For example, the drone 2 may select the measurement report process to beperformed on the basis of the flight-related information. Specifically,the drone 2 may select the first measurement report process in a case inwhich the drone 2 is flying, and may select the second measurementreport process in a case in which the drone 2 is stopping. Thus, forexample, in the case in which the drone 2 is flying, the drone 2 is in ahigher risk than in the case in which the drone 2 is stopping.Therefore, the more detailed measurement report process can be selected.Further, the drone 2 may select the first measurement report process ina case in which the drone 2 performs a flight by manual maneuvering, andmay select the second measurement report process in a case in which thedrone 2 performs a flight by automatic maneuvering. Thus, for example,in a case in which the drone 2 performs the flight by the automaticmaneuvering, the drone 2 is in a higher risk than in the case in whichthe drone 2 performs the flight by manual maneuvering. Therefore, themore detailed measurement report process can be selected.

Note that the switching threshold may be set on the basis of at least aninstruction from the base station device 1. For example, the basestation device 1 may transmit the setting information indicating theswitching threshold to be set to the drone 2. Further, the base stationdevice 1 may transmit the parameter for deciding the switching thresholdto be set to the drone 2 and the drone 2 may set the switching thresholdon the basis of the parameter.

Selection Entity - Drone 2 Serving as Entity

The measurement report process may be selected by the drone 2 serving asan entity. That is, the drone 2 (for example, the measurement reportcontrol unit 2013) may select the measurement report process to beperformed. Specifically, the drone 2 selects the measurement reportprocess to be performed on the basis of the flight-related informationfrom the plurality of measurement report processes of the selectioncandidates spontaneously (that is, autonomously) on the basis of theselection standard. In this case, the drone 2 causes the base stationdevice 1 to recognize the selection (that is, the switching) of themeasurement report process. Various methods of causing the base stationdevice 1 to recognize the selection are considered.

For example, the drone 2 may notify the base station device 1 ofinformation regarding the selection of the measurement report process.The information regarding the selection of the measurement reportprocess can include, for example, information indicating the selectedmeasurement report process, information indicating a timing of theswitching, and the like. The information regarding the selection of themeasurement report process can also be ascertained as informationregarding switching control of the measurement report process. Theinformation regarding the selection of the measurement report processmay be notified of dynamically using a physical channel or a physicalsignal or may be notified quasi-statically using RRC signaling or an MACsignaling. Further, the information may be notified periodically oraperiodically. For example, the drone 2 can notify the base stationdevice 1 of the information regarding the selection of the measurementreport process on the basis of a timing at which the measurement reportprocess is switched. Further, the drone 2 can include the informationregarding the selection of the measurement report process in themeasurement information to notify of the information regarding theselection of the measurement report process.

For example, the drone 2 may notify the base station device 1 ofinformation regarding a selection result of the measurement reportprocess explicitly, as described above, or implicitly. In a case inwhich the drone 2 notifies the base station device 1 of the informationimplicitly, the base station device 1 may recognize the selectedmeasurement report process, for example, by identifying whichmeasurement report process is used to generate the measurementinformation reported from the drone 2 among the plurality of measurementreport processes of the selection candidates.

Hereinafter, an example of a flow of a process in a case in which thedrone 2 serves as an entity and selects the measurement report processwill be described.

FIG. 25 is a sequence diagram illustrating an example of the flow of themeasurement report process performed in the system according to thepresent embodiment. The base station device 1 and the drone 2 areinvolved in this sequence. Note that in FIG. 25 , the higher layerprocessing unit 201 and the flight control unit 214 are separatelyillustrated to clarify exchange of information in the drone 2. Note thata process performed by the higher layer processing unit 201 can includenot only a process related to a higher layer but also a process of aphysical layer.

As illustrated in FIG. 25 , the base station device 1 first transmitsthe setting information regarding the measurement report process to thedrone 2 (step S402). Note that the setting information regarding themeasurement report process can include setting information of athreshold related to the selection of the measurement report process(that is, a switching threshold). Subsequently, the higher layerprocessing unit 201 of the drone 2 acquires the flight-relatedinformation from the flight control unit 214 of the drone 2 (step S404).Then, the higher layer processing unit 201 of the drone 2 selects themeasurement report process to be performed on the basis of theflight-related information (step S406). On the other hand, the basestation device 1 transmits the reference signal to the drone 2 (stepS408). Subsequently, the drone 2 performs the selected measurementreport process and transmits the measurement information to the basestation device 1 (step S410). Note that the drone 2 may transmit theinformation regarding the selection of the measurement report process tothe base station device 1 before, after, or simultaneously with thetransmission of the measurement information.

- Base Station Device 1 Serving as Entity

The measurement report process may be selected by the base stationdevice 1 serving as an entity. In this case, the base station device 1(for example, the communication control unit 1013) generates the settinginformation regarding the measurement report process on the basis of theflight-related information received from the drone 2 and notifies thedrone 2 of the setting information. In particular, the settinginformation relates to the selection of the measurement report processto be performed. Specifically, the base station device 1 selects themeasurement report process to be caused to be performed by the drone 2on the basis of the flight-related information received from the drone 2among the plurality of measurement report processes of the selectioncandidates on the basis of the selection standard. Then, the basestation device 1 notifies the drone 2 of the information regarding theselection of the measurement report process.

The drone 2 (for example, the measurement report control unit 2013)performs the measurement report process selected by the base stationdevice 1. Specifically, the drone 2 performs the measurement reportprocess selected by the base station device 1 on the basis of theinformation regarding the selection of the measurement report processnotified of from the base station device 1.

Hereinafter, an example of a flow of a process in a case in which themeasurement report process is selected by the base station device 1serving as an entity will be described.

FIG. 26 is a sequence diagram illustrating an example of the flow of themeasurement report process performed in the system according to thepresent embodiment. The base station device 1 and the drone 2 areinvolved in this sequence. Note that in FIG. 26 , the higher layerprocessing unit 201 and the flight control unit 214 are separatelyillustrated to clarify exchange of information in the drone 2. Note thata process performed by the higher layer processing unit 201 can includenot only a process related to a higher layer but also a process of aphysical layer.

As illustrated in FIG. 26 , the base station device 1 first transmitsthe setting information regarding the measurement report process to thedrone 2 (step S502). Subsequently, the higher layer processing unit 201of the drone 2 acquires the flight-related information from the flightcontrol unit 214 of the drone 2 (step S504). Subsequently, the drone 2transmits the flight-related information to the base station device 1(step S506). Then, the base station device 1 selects the measurementreport process to be caused to be performed by the drone 2 on the basisof the received flight-related information (step S508). Subsequently,the base station device 1 transmits the information regarding theselection of the measurement report process to the drone 2 (step S510).Subsequently, the base station device 1 transmits the reference signalto the drone 2 (step S512). Subsequently, the drone 2 performs themeasurement report process selected by the base station device 1 on thebasis of the information regarding the selection of the measurementreport process and transmits the measurement information to the basestation device 1 (S514).

Content of Measurement Report Processes of Selection Candidates

Next, content of the measurement report processes of the selectioncandidates will be described specifically.

For example, in the plurality of measurement report processes of theselection candidates, a reference signal of the measurement target ismutually different. That is, the drone 2 may select the reference signalof the measurement target from reference signals of selection candidateson the basis of the flight-related information. For example, thereference signals of the selection candidates may include a referencesignal specific to a cell and a reference signal specific to theterminal device (that is, the drone 2). Further, the reference signalsof the selection candidates may include reference signals in which atransmission period or a transmission density is different. Further, thereference signals of the selection candidates may include a referencesignal transmitted periodically and a reference signal transmittedaperiodically. The drone 2 can control measurement precision and anoverhead by the reference signal by selecting the reference signal ofthe measurement target.

For example, in the plurality of measurement report processes of theselection candidates, a type of measurement information to be reportedmay be mutually different. That is, the drone 2 may select the type ofmeasurement information to be reported from the types of measurementinformation of the selection candidates on the basis of theflight-related information. For example, the types of measurementinformation of the selection candidates may include at least any of theRRM information. Further, the types of measurement information of theselection candidates may include at least any of the CSI information.The base station device 1 can receive a report of an optimum type ofmeasurement information in accordance with a state or a situation of thedrone 2 when the drone 2 selects the type of measurement information tobe reported.

For example, in the plurality of measurement report processes of theselection candidates, required quality of measurement information to bereported may be mutually different. That is, the drone 2 may select therequired quality of the measurement information to be reported fromrequired quality of the selection candidates on the basis of theflight-related information. For example, the required quality of theselection candidates may include a candidate for quality serving as astandard of decision of an encoding method, a candidate for qualityserving as a standard of decision of an encoding ratio, a candidate fora required error ratio, and a candidate for reception quality. Further,the required quality of the selection candidates may include a candidatefor a required error ratio for a downlink channel which is a CSImeasurement target. Note that a value of the CQI, the PMI, the RI,and/or the CRI to be reported as a result is changed by selecting thedifferent required quality. The base station device 1 can receive areport of the measurement information corresponding to the optimumrequired quality in accordance with a state or a situation of the drone2 when the drone 2 selects the required quality of the measurementinformation to be reported.

For example, in the plurality of measurement report processes of theselection candidates, a report method may be mutually different. Thatis, the drone 2 may select the report method to be used to report themeasurement information from report methods of the selection candidates.Hereinafter, the report methods of the selection candidates will bedescribed.

In each of the report methods of the selection candidates, a report modeof the measurement information may be different. That is, the drone 2may select the report mode to be used to report the measurementinformation from the plurality of candidates for the report mode on thebasis of the flight-related information. The candidates for the reportmode may include a mode in which a wideband is reported, a mode in whicha terminal selection type of sub band is reported, a mode in which a subband set with signaling of a higher layer by the base station device 1is reported, a mode in which predetermined information is not reported,a mode in which one piece of predetermined information is reported, amode in which a plurality of pieces of predetermined information arereported, and a combination of these modes. The base station device 1can receive the report of the measurement information in an optimumreport mode in accordance with a state or a situation of the drone 2when the drone 2 selects the report mode.

In each of the report methods of the selection candidates, a reportperiod of the measurement information may be different. That is, thedrone 2 may select a period at which the measurement information isreported from a plurality of candidates for the period on the basis ofthe flight-related information. The base station device 1 can receivethe report of the measurement information in an optimum period inaccordance with a state or a situation of the drone 2 when the drone 2selects the report period.

In each of the report methods of the selection candidates, whether thereport of the measurement information is periodic or aperiodic may bedifferent. That is, the drone 2 may select whether to perform periodicreport or aperiodic report on the basis of the flight-relatedinformation. In the periodic report method, the drone 2 sequentiallytransmits some of the predetermined information (for example, themeasurement information) at a period set by the base station device 1.In the periodic report method, the PUCCH is used for the report. On theother hand, in the aperiodic report method, the drone 2 collectivelytransmits all of the predetermined information (for example, themeasurement information) at a timing notified of by the base stationdevice 1. In the aperiodic report method, the PUSCH is used for thereport. For example, in a case in which the drone 2 is flying at a lowaltitude and performs wireless communication using radio waves orienteddownward from the base station device 1, the drone 2 performs theperiodic report. In a case in which the drone 2 is flying at a highaltitude and performs wireless communication using a beam formedindividually from the base station device 1, the drone 2 performs theaperiodic report. Further, for example, in a case in which the drone 2is stopping on the ground and performs wireless communication usingradio waves oriented downward from the base station device 1, the drone2 performs the aperiodic report. In a case in which the drone 2 isflying at a high altitude and performs wireless communication using abeam formed individually from the base station device 1, the drone 2performs the periodic report. The base station device 1 can receive thereport of the measurement information using an optimum method inaccordance with a state or a situation of the drone 2 when the drone 2selects the periodic report or the aperiodic report.

In each of the report methods of the selection candidates, an uplinkchannel to be used to report the measurement information may bedifferent. That is, the drone 2 may select an uplink channel to be usedto report the measurement information from uplink channels of selectioncandidates on the basis of the flight-related information. For example,the uplink channels of the selection candidates may include the PUCCHand the PUSCH.

In each of the report methods of the selection candidates, requiredquality of the uplink channel to be used to report the measurementinformation may be different. That is, the drone 2 may select therequired quality of the uplink channel to be used to report themeasurement information from the required quality of selectioncandidates on the basis of the flight-related information. For example,the required quality of the selection candidates may include a candidatefor quality serving as a standard of decision of an encoding method forthe uplink channel to be used to report the measurement information, acandidate for quality serving a standard of decision of an encodingratio, a candidate for a required error ratio, and a candidate forreception quality. The base station device 1 can receive a report of themeasurement information corresponding to the optimum required quality inaccordance with a state or a situation of the drone 2 when the drone 2selects the required quality of the uplink channel to be used to reportthe measurement information.

<4.5. Supplement> Flight-Related Information

As described above, the flight-related information is transmitted (orreported or notified) from the drone 2 to the base station device 1 insome cases. The base station device 1 can control the drone 2 which is atransmission source on the basis of the flight-related informationreceived from the drone 2.

Hereinafter, a method of transmitting the flight-related informationwill be described in detail.

The flight-related information may be transmitted as informationregarding the RRC layer, the MAC layer, and/or the PHY layer.

The flight-related information can be transmitted at any of variousopportunities. For example, the drone 2 may transmit the flight-relatedinformation in response to a request from the base station device 1. Forexample, the drone 2 may sequentially transmit the flight-relatedinformation at a period set by the base station device 1. For example,the drone 2 may transmit the flight-related information in a case inwhich a predetermined condition is satisfied. Here, the predeterminedcondition may be given by a timer set by the base station device 1. Inthis case, the drone 2 transmits the flight-related information in acase in which the timer expires.

The flight-related information may be transmitted as the CSI. Forexample, the flight-related information is used to generate the CRI, theRI, the PMI, and/or the CQI. In other words, the CRI, the RI, the PMI,and/or the CQI is generated on the basis of at least the flight-relatedinformation. Additionally, the flight-related information may betransmitted as the CSI which is newly defined.

The flight-related information may be transmitted as uplink controlinformation (UCI) which is transmitted with the PUCCH. For example, theflight-related information is used to generate the CSI, a schedulingrequest (SR), and/or an HARQ-ACK. In other words, the CSI, the SR,and/or the HARQ-ACK is generated on the basis of at least theflight-related information. Additionally, the flight-related informationmay be transmitted as the UCI which is newly defined.

Capacity Information

The drone 2 may transmit (or report or notify) information indicating anability of the drone 2 to the base station device 1. In this case, thebase station device 1 can control the drone 2 which is a transmissionsource on the basis of the information indicating the ability of thedrone 2. The information indicating the ability of the drone 2 isreferred to as terminal ability information or capability informationbelow. The capability information includes information indicating anability (that is, a function, a feature, and/or a technique) supportedby the drone 2.

The UE capability information can include information indicating whetherthe terminal device 2 including a drone has an ability to fly. In a casein which the capability information indicates that the terminal device 2has the ability to fly, it is recognized that the terminal device 2 is adrone. Further, the capability information can include informationindicating a drone category indicating which drone the terminal device 2is.

The capability information can include information regarding a functionrelated to the measurement report process and/or a function of a processbased on the flight-related information. For example, the capabilityinformation can include information regarding a battery such as acapacity, information regarding an altitude such as a highest altitude,information regarding support of a measurement method in accordance withan altitude, information regarding a speed such as a maximum speed, andinformation regarding sensor precision such as precision of positionalinformation.

The capability information can include information indicating a functionrelated to support of ultra reliable low latency communication (URLLC).For example, the capability information can include informationindicating a function related to support of data transmission (forexample, short TTI) of low latency, a function related to support of apredetermined sub carrier interval (for example, a sub carrier intervalgreater than 15 kHz), and/or a function of simultaneously connecting aplurality of links (for example, beams or component carriers).

5. Application Examples

The technology according to the present disclosure can be applied tovarious products. For example, the base station device 1 may be realizedas any type of evolved Node B (eNB) such as a macro eNB or a small eNB.The small eNB may be an eNB that covers a cell, such as a pico eNB, amicro eNB, or a home (femto) eNB, smaller than a macro cell. Instead,the base station device 1 may be realized as another type of basestation such as a NodeB or a base transceiver station (BTS). The basestation device 1 may include a main entity (also referred to as a basestation device) that controls wireless communication and one or moreremote radio heads (RRHs) disposed at different locations from the mainentity. Further, various types of terminals to be described below mayoperate as the base station device 1 by performing a base stationfunction temporarily or semi-permanently.

<5.1. Application Examples for Base Station> (First Application Example)

FIG. 27 is a block diagram illustrating a first example of a schematicconfiguration of an eNB to which the technology according to the presentdisclosure may be applied. An eNB 800 includes one or more antennas 810and a base station apparatus 820. Each antenna 810 and the base stationapparatus 820 may be connected to each other via an RF cable.

Each of the antennas 810 includes a single or a plurality of antennaelements (e.g., a plurality of antenna elements constituting a MIMOantenna) and is used for the base station apparatus 820 to transmit andreceive a wireless signal. The eNB 800 may include the plurality of theantennas 810 as illustrated in FIG. 27 , and the plurality of antennas810 may, for example, correspond to a plurality of frequency bands usedby the eNB 800. It should be noted that while FIG. 27 illustrates anexample in which the eNB 800 includes the plurality of antennas 810, theeNB 800 may include the single antenna 810.

The base station apparatus 820 includes a controller 821, a memory 822,a network interface 823, and a wireless communication interface 825.

The controller 821 may be, for example, a CPU or a DSP, and operatesvarious functions of an upper layer of the base station apparatus 820.For example, the controller 821 generates a data packet from data in asignal processed by the wireless communication interface 825, andtransfers the generated packet via the network interface 823. Thecontroller 821 may generate a bundled packet by bundling data from aplurality of base band processors to transfer the generated bundledpacket. Further, the controller 821 may also have a logical function ofperforming control such as radio resource control, radio bearer control,mobility management, admission control, and scheduling. Further, thecontrol may be performed in cooperation with a surrounding eNB or a corenetwork node. The memory 822 includes a RAM and a ROM, and stores aprogram executed by the controller 821 and a variety of control data(such as, for example, terminal list, transmission power data, andscheduling data).

The network interface 823 is a communication interface for connectingthe base station apparatus 820 to the core network 824. The controller821 may communicate with a core network node or another eNB via thenetwork interface 823. In this case, the eNB 800 may be connected to acore network node or another eNB through a logical interface (e.g., S1interface or X2 interface). The network interface 823 may be a wiredcommunication interface or a wireless communication interface forwireless backhaul. In the case where the network interface 823 is awireless communication interface, the network interface 823 may use ahigher frequency band for wireless communication than a frequency bandused by the wireless communication interface 825.

The wireless communication interface 825 supports a cellularcommunication system such as long term evolution (LTE) or LTE-Advanced,and provides wireless connection to a terminal located within the cellof the eNB 800 via the antenna 810. The wireless communication interface825 may typically include a base band (BB) processor 826, an RF circuit827, and the like. The BB processor 826 may, for example, performencoding/decoding, modulation/demodulation, multiplexing/demultiplexing,and the like, and performs a variety of signal processing on each layer(e.g., L1, medium access control (MAC), radio link control (RLC), andpacket data convergence protocol (PDCP)). The BB processor 826 may havepart or all of the logical functions as described above instead of thecontroller 821. The BB processor 826 may be a module including a memoryhaving a communication control program stored therein, a processor toexecute the program, and a related circuit, and the function of the BBprocessor 826 may be changeable by updating the program. Further, themodule may be a card or blade to be inserted into a slot of the basestation apparatus 820, or a chip mounted on the card or the blade.Meanwhile, the RF circuit 827 may include a mixer, a filter, anamplifier, and the like, and transmits and receives a wireless signalvia the antenna 810.

The wireless communication interface 825 may include a plurality of theBB processors 826 as illustrated in FIG. 27 , and the plurality of BBprocessors 826 may, for example, correspond to a plurality of frequencybands used by the eNB 800. Further, the wireless communication interface825 may also include a plurality of the RF circuits 827, as illustratedin FIG. 27 , and the plurality of RF circuits 827 may, for example,correspond to a plurality of antenna elements. Note that FIG. 27illustrates an example in which the wireless communication interface 825includes the plurality of BB processors 826 and the plurality of RFcircuits 827, but the wireless communication interface 825 may includethe single BB processor 826 or the single RF circuit 827.

In the eNB 800 illustrated in FIG. 27 , one or more constituent elements(for example, the reference signal transmitting unit 1011 and/or thecommunication control unit 1013 illustrated in FIG. 18 ) included in thehigher layer processing unit 101 or the control unit 103 described withreference to FIG. 8 may be implemented in the wireless communicationinterface 825. Alternatively, at least some of the constituent elementsmay be implemented in the controller 821. As one example, a moduleincluding a part or the whole of (for example, the BB processor 826) ofthe wireless communication interface 825 and/or the controller 821 maybe implemented on the eNB 800. The one or more constituent elements inthe module may be implemented in the module. In this case, the modulemay store a program causing a processor to function as the one or moreconstituent elements (in other words, a program causing the processor toexecute operations of the one or more constituent elements) and executethe program. As another example, a program causing the processor tofunction as the one or more constituent elements may be installed in theeNB 800, and the wireless communication interface 825 (for example, theBB processor 826) and/or the controller 821 may execute the program. Inthis way, the eNB 800, the base station device 820, or the module may beprovided as a device including the one or more constituent elements anda program causing the processor to function as the one or moreconstituent elements may be provided. In addition, a readable recordingmedium on which the program is recorded may be provided.

Further, in the eNB 800 illustrated in FIG. 27 , the receiving unit 105and the transmitting unit 107 described with reference to FIG. 8 may beimplemented in the wireless communication interface 825 (for example,the RF circuit 827). Further, the transceiving antenna 109 may beimplemented in the antenna 810.

(Second Application Example)

FIG. 28 is a block diagram illustrating a second example of a schematicconfiguration of an eNB to which the technology according to the presentdisclosure may be applied. An eNB 830 includes one or more antennas 840,a base station apparatus 850, and an RRH 860. Each of the antennas 840and the RRH 860 may be connected to each other via an RF cable. Further,the base station apparatus 850 and the RRH 860 may be connected to eachother by a high speed line such as optical fiber cables.

Each of the antennas 840 includes a single or a plurality of antennaelements (e.g., antenna elements constituting a MIMO antenna), and isused for the RRH 860 to transmit and receive a wireless signal. The eNB830 may include a plurality of the antennas 840 as illustrated in FIG.28 , and the plurality of antennas 840 may, for example, correspond to aplurality of frequency bands used by the eNB 830. Note that FIG. 28illustrates an example in which the eNB 830 includes the plurality ofantennas 840, but the eNB 830 may include the single antenna 840.

The base station apparatus 850 includes a controller 851, a memory 852,a network interface 853, a wireless communication interface 855, and aconnection interface 857. The controller 851, the memory 852, and thenetwork interface 853 are similar to the controller 821, the memory 822,and the network interface 823 described with reference to FIG. 27 .

The wireless communication interface 855 supports a cellularcommunication system such as LTE and LTE-Advanced, and provides wirelessconnection to a terminal located in a sector corresponding to the RRH860 via the RRH 860 and the antenna 840. The wireless communicationinterface 855 may typically include a BB processor 856 or the like. TheBB processor 856 is similar to the BB processor 826 described withreference to FIG. 27 except that the BB processor 856 is connected to anRF circuit 864 of the RRH 860 via the connection interface 857. Thewireless communication interface 855 may include a plurality of the BBprocessors 856, as illustrated in FIG. 28 , and the plurality of BBprocessors 856 may, for example, correspond to a plurality of frequencybands used by the eNB 830. Note that FIG. 28 illustrates an example inwhich the wireless communication interface 855 includes the plurality ofBB processors 856, but the wireless communication interface 855 mayinclude the single BB processor 856.

The connection interface 857 is an interface for connecting the basestation apparatus 850 (wireless communication interface 855) to the RRH860. The connection interface 857 may be a communication module forcommunication on the high speed line which connects the base stationapparatus 850 (wireless communication interface 855) to the RRH 860.

Further, the RRH 860 includes a connection interface 861 and a wirelesscommunication interface 863.

The connection interface 861 is an interface for connecting the RRH 860(wireless communication interface 863) to the base station apparatus850. The connection interface 861 may be a communication module forcommunication on the high speed line.

The wireless communication interface 863 transmits and receives awireless signal via the antenna 840. The wireless communicationinterface 863 may typically include the RF circuit 864 or the like. TheRF circuit 864 may include a mixer, a filter, an amplifier and the like,and transmits and receives a wireless signal via the antenna 840. Thewireless communication interface 863 may include a plurality of the RFcircuits 864 as illustrated in FIG. 28 , and the plurality of RFcircuits 864 may, for example, correspond to a plurality of antennaelements. Note that FIG. 28 illustrates an example in which the wirelesscommunication interface 863 includes the plurality of RF circuits 864,but the wireless communication interface 863 may include the single RFcircuit 864.

In the eNB 830 illustrated in FIG. 28 , one or more constituent elements(for example, the reference signal transmitting unit 1011 and/or thecommunication control unit 1013 illustrated in FIG. 18 ) included in thehigher layer processing unit 101 or the control unit 103 described withreference to FIG. 8 may be implemented in the wireless communicationinterface 855 and/or the wireless communication interface 863.Alternatively, at least some of the constituent elements may beimplemented in the controller 851. As one example, a module including apart or the whole of (for example, the BB processor 856) of the wirelesscommunication interface 825 and/or the controller 851 may be implementedon the eNB 830. The one or more constituent elements in the module maybe implemented in the module. In this case, the module may store aprogram causing a processor to function as the one or more constituentelements (in other words, a program causing the processor to executeoperations of the one or more constituent elements) and execute theprogram. As another example, a program causing the processor to functionas the one or more constituent elements may be installed in the eNB 830,and the wireless communication interface 855 (for example, the BBprocessor 856) and/or the controller 851 may execute the program. Inthis way, the eNB 830, the base station device 850, or the module may beprovided as a device including the one or more constituent elements anda program causing the processor to function as the one or moreconstituent elements may be provided. In addition, a readable recordingmedium on which the program is recorded may be provided.

Further, in the eNB 830 illustrated in FIG. 28 , for example, thereceiving unit 105 and the transmitting unit 107 described withreference to FIG. 8 may be implemented in the wireless communicationinterface 863 (for example, the RF circuit 864). Further, thetransceiving antenna 109 may be implemented in the antenna 840.

6. Conclusion

The embodiment of the present disclosure has been described above indetail with reference to FIGS. 1 to 28 . As described above, the drone 2according to the embodiment acquires the flight-related information andcontrols the measurement report process on the reference signaltransmitted from the base station device 1 on the basis of the acquiredflight-related information. Since the drone 2 controls the measurementreport process on the basis of the flight-related information, the basestation device 1 can control the radio resources for communication withthe drone 2 on the basis of the measurement information reported inaccordance with the flight-related information. Thus, the base stationdevice 1 can provide an appropriate wireless communication service tothe drone 2 which flies freely in 3-dimensional space. Thus, it ispossible to considerably cause transmission efficiency of the wholesystem to be improved and it is possible to cause the ability of thedrone 2 to be exhibited at the maximum.

The preferred embodiment(s) of the present disclosure has/have beendescribed above with reference to the accompanying drawings, whilst thepresent disclosure is not limited to the above examples. A personskilled in the art may find various alterations and modifications withinthe scope of the appended claims, and it should be understood that theywill naturally come under the technical scope of the present disclosure.

For example, the first embodiment and the second embodiment may becombined.

Further, the effects described in this specification are merelyillustrative or exemplified effects, and are not limitative. That is,with or in the place of the above effects, the technology according tothe present disclosure may achieve other effects that are clear to thoseskilled in the art from the description of this specification.

Additionally, the present technology may also be configured as below.

A circuit including:

-   an acquisition unit configured to acquire information regarding a    flight; and-   a measurement report control unit configured to control a    measurement report process on a reference signal transmitted from a    base station device, on a basis of the information regarding the    flight acquired by the acquisition unit.

The circuit according to (1), in which the information regarding theflight includes altitude information regarding the flight.

The circuit according to (1) or (2), in which the information regardingthe flight includes battery information regarding the flight.

The circuit according to any one of (1) to (3), in which the informationregarding the flight includes positional information regarding theflight.

The circuit according to any one of (1) to (4), in which the informationregarding the flight includes state information regarding the flight.

The circuit according to any one of (1) to (5), in which measurementinformation regarding the reference signal reported in the measurementreport process includes information for radio resource management.

The circuit according to any one of (1) to (6), in which measurementinformation regarding the reference signal reported in the measurementreport process includes channel state information.

The circuit according to any one of (1) to (7), in which measurementinformation regarding the reference signal reported in the measurementreport process is reported using a predetermined uplink channel.

The circuit according to (8), in which the predetermined uplink channelis one uplink channel allocated by the base station device.

The circuit according to (8), in which the predetermined uplink channelis a plurality of uplink channels periodically allocated by the basestation device.

The circuit according to (8), in which the predetermined uplink channelis an uplink channel selected by the measurement report control unitfrom a resource pool allocated by the base station device.

The circuit according to any one of (1) to (11), in which themeasurement report control unit controls whether or not measurementinformation is reported to the base station device on a basis of acomparison result of a threshold and a value based on predeterminedinformation.

The circuit according to (12), in which the predetermined information isinformation regarding the flight.

The circuit according to (13), in which the threshold is set on a basisof an instruction from the base station device.

The circuit according to (12), in which the predetermined information ismeasurement information regarding the reference signal.

The circuit according to (15), in which the threshold is set on a basisof information regarding the flight.

The circuit according to any one of (1) to (16), in which themeasurement report control unit performs a measurement report processselected from a plurality of measurement report processes that areselection candidates, on a basis of the information regarding theflight.

The circuit according to (17), in which, in the plurality of measurementreport processes of the selection candidates, the reference signal of ameasurement target is mutually different.

The circuit according to (17) or (18), in which, in the plurality ofmeasurement report processes of the selection candidates, a type ofmeasurement information to be reported is mutually different.

The circuit according to any one of (17) to (19), in which in theplurality of measurement report processes of the selection candidates,required quality of measurement information to be reported is mutuallydifferent.

The circuit according to any one of (17) to (20), in which, in theplurality of measurement report processes of the selection candidates, areport method is mutually different.

The circuit according to any one of (17) to (21), in which themeasurement report control unit selects the measurement report processto be performed.

The circuit according to any one of (17) to (21), in which themeasurement report control unit performs the measurement report processselected by the base station device.

The circuit according to any one of (1) to (23), in which theacquisition unit acquires the information regarding the flight from aflyable flight device.

The circuit according to (24), in which the circuit is connected to theflight device.

A terminal device including:

-   an acquisition unit configured to acquire information regarding a    flight; and-   a measurement report control unit configured to control a    measurement report process on a reference signal transmitted from a    base station device, on a basis of the information regarding the    flight acquired by the acquisition unit.

A base station device including:

-   a reference signal transmitting unit configured to transmit a    reference signal; and-   a control unit configured to acquire information regarding a flight    and control a process based on measurement information reported from    a terminal device that performs a measurement report process on the    reference signal on a basis of the acquired information regarding    the flight.

The base station device according to (27), in which the control unitgenerates setting information regarding the measurement report processon a basis of the information regarding the flight received from theterminal device, and notifies the terminal device.

The base station device according to (28), in which the settinginformation is related to a trigger for reporting the measurementinformation.

The base station device according to (28) or (29), in which the controlunit is related to selection of the measurement report process to beperformed.

A method including:

-   acquiring information regarding a flight; and-   controlling, by a processor, a measurement report process on a    reference signal transmitted from a base station device, on a basis    of the acquired information regarding the flight.

A method including:

-   transmitting a reference signal; and-   acquiring information regarding a flight and controlling a process    based on measurement information reported from a terminal device    that performs a measurement report process on the reference signal    on a basis of the acquired information regarding the flight, by a    processor.

A storage medium having a program stored therein, the program causing acomputer to function as:

-   an acquisition unit configured to acquire information regarding a    flight; and-   a measurement report control unit configured to control a    measurement report process on a reference signal transmitted from a    base station device, on a basis of the information regarding the    flight acquired by the acquisition unit.

A storage medium having a program stored therein, the program causing acomputer to function as:

-   a reference signal transmitting unit configured to transmit a    reference signal; and-   a control unit configured to acquire information regarding a flight    and control a process based on measurement information reported from    a terminal device that performs a measurement report process on the    reference signal on a basis of the acquired information regarding    the flight.

Reference Signs List 1 base station device 101 higher layer processingunit 1011 reference signal transmitting unit 1013 communication controlunit 103 control unit 105 receiving unit 1051 decoding unit 1053demodulating unit 1055 demultiplexing unit 1057 wireless receiving unit1059 channel measuring unit 107 transmitting unit 1071 encoding unit1073 modulating unit 1075 multiplexing unit 1077 wireless transmittingunit 1079 downlink reference signal generating unit 109 transceivingantenna 2 terminal device 201 higher layer processing unit 2011acquisition unit 2013 measurement report control unit 203 control unit205 receiving unit 2051 decoding unit 2053 demodulating unit 2055demultiplexing unit 2057 wireless receiving unit 2059 channel measuringunit 207 transmitting unit 2071 encoding unit 2073 modulating unit 2075multiplexing unit 2077 wireless transmitting unit 2079 uplink referencesignal generating unit 209 transceiving antenna 210 flight device 211driving unit 212 battery unit 213 sensor unit 214 flight control unit

1. A processing device, comprising: circuitry configured to: acquire analtitude information of a flight device; control a measurement reportprocess on a reference signal transmitted from a base station device ona basis of the altitude information; and report measurement informationto the base station device based on a comparison result of the altitudeinformation of the flight device and a threshold, wherein themeasurement information includes information for radio resourcemanagement, which includes at least one of reference signal receivedpower (RSRP), a received signal strength indicator (RSSI), referencesignal received quality (RSRQ), a signal to noise power ratio (SNR),and/or a signal to interference and noise power ratio (SINR), thethreshold is set based on an instruction from the base station device,and when the altitude information-based value is above the threshold,the measurement report process is performed.
 2. The processing deviceaccording to claim 1, wherein the altitude information includespositional information regarding the flight.
 3. The processing deviceaccording to claim 1, wherein the altitude information includes stateinformation regarding the flight.
 4. The processing device according toclaim 1, wherein measurement information regarding the reference signalreported in the measurement report process includes information forradio resource management.
 5. The processing device according to claim1, wherein measurement information regarding the reference signalreported in the measurement report process includes channel stateinformation.
 6. The processing device according to claim 1, whereinmeasurement information regarding the reference signal reported in themeasurement report process is reported using a predetermined uplinkchannel.
 7. The processing device according to claim 1, wherein thethreshold is set on a basis of an instruction from the base stationdevice.
 8. The processing device according to claim 1, wherein thecircuitry performs a measurement report process selected from aplurality of measurement report processes that are selection candidates,on a basis of the information regarding the flight.
 9. The processingdevice according to claim 1, wherein the circuitry acquires the altitudeinformation from the flight device.
 10. The processing device accordingto claim 1, wherein the altitude information of the flight devicefurther includes a relative position from a site including apredetermined reference point.
 11. A terminal device, comprising:circuitry configured to: acquire an altitude information of a flightdevice; control a measurement report process on a reference signaltransmitted from a base station device, on a basis of the altitudeinformation; and report measurement information to the base stationdevice based on a comparison result of the altitude information of theflyable flight and a threshold, wherein the measurement informationincludes information for radio resource management, which includes atleast one of reference signal received power (RSRP), a received signalstrength indicator (RSSI), reference signal received quality (RSRQ), asignal to noise power ratio (SNR), and/or a signal to interference andnoise power ratio (SINR), the threshold is set based on an instructionfrom the base station device, and when the altitude information-basedvalue is above threshold, the measurement report process is performed.12. A base station device, comprising: circuitry configured to: transmita reference signal; and acquire an altitude information of a terminaldevice and receive measurement information reported from the terminaldevice that performs a measurement report process on the referencesignal on a basis of the altitude information, the measurementinformation being reported to the base station device based on acomparison result of an altitude information of the terminal device anda threshold, wherein the measurement information includes informationfor radio resource management, which includes at least one of referencesignal received power (RSRP), a received signal strength indicator(RSSI), reference signal received quality (RSRQ), a signal to noisepower ratio (SNR), and/or a signal to interference and noise power ratio(SINR), the threshold is set based on an instruction from the basestation device, and when the altitude information-based value is abovethe threshold, the measurement report process is performed.
 13. The basestation device according to claim 12, wherein the circuitry generatessetting information regarding the measurement report process on a basisof the altitude information received from the terminal device, andnotifies the terminal device.
 14. The base station device according toclaim 13, wherein the setting information is related to a trigger forreporting the measurement information.
 15. The base station deviceaccording to claim 13, wherein the circuitry selects the measurementreport process to be performed.
 16. A method, comprising: acquiring analtitude information of a flight device; controlling a measurementreport process on a reference signal transmitted from a base stationdevice on a basis of the altitude information; and reporting measurementinformation to the base station device based on a comparison result ofthe altitude information of the flyable flight and a threshold, whereinthe measurement information includes information for radio resourcemanagement, which includes at least one of reference signal receivedpower (RSRP), a received signal strength indicator (RSSI), referencesignal received quality (RSRQ), a signal to noise power ratio (SNR),and/or a signal to interference and noise power ratio (SINR), thethreshold is set based on an instruction from the base station device,and when the altitude information-based value is above the threshold,the measurement report process is performed.
 17. The processing deviceaccording to claim 1, wherein when the altitude information-based valueis above the threshold, an entering condition and a leaving conditionare considered by deciding whether an inequality condition for theentering condition and an inequality condition for the leaving conditionare satisfied, and when the altitude information-based value is belowthe threshold, an entering condition and a leaving condition areconsidered by deciding whether an inequality condition for the enteringcondition and an inequality condition for the leaving condition aresatisfied.
 18. The terminal device according to claim 11, wherein thealtitude of the terminal device and a highest altitude and a lowestaltitude that the terminal device is configured to fly are included inthe information acquired by the circuitry.
 19. The base station deviceaccording to claim 12, wherein the reference signal is a cell-specificreference signal.